Materiały źródłowe

• #1 Hydrocephalus – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/hydrocephalus/symptoms-causes/syc-20373604

  Hydrocephalus is caused by an imbalance between how much cerebrospinal fluid is produced and how much is absorbed into the bloodstream. […] Too much cerebrospinal fluid in the ventricles can occur for one of the following reasons: […] Obstruction. Partial blockage of the flow of cerebrospinal fluid is the most common cause of too much cerebrospinal fluid in the ventricles. […] Poor absorption. Less common is a problem with absorbing cerebrospinal fluid. This is often related to inflammation of brain tissues from disease or injury. […] Overproduction. Rarely, cerebrospinal fluid is created more quickly than it can be absorbed. […] Much of the time, the cause of hydrocephalus is not known. However, developmental or medical problems can contribute to or trigger hydrocephalus. […] Hydrocephalus may be present at or before birth, known as congenital hydrocephalus. Or it can occur shortly after birth. Any of the following incidents may cause hydrocephalus in newborns:

• #1 Hydrocephalus – AANS

  https://www.aans.org/patients/conditions-treatments/hydrocephalus/

  Little is understood about the causes of hydrocephalus. Some cases of hydrocephalus are present at birth, while others develop in childhood or adulthood. Hydrocephalus can be inherited genetically, may be associated with developmental disorders, like spina bifida or encephalocele, or occur as a result of brain tumors, head injuries, hemorrhage or diseases such as meningitis. […] Based on onset, presence of structural defects or high vs. normal CSF pressures, hydrocephalus can be divided into categories. […] Acquired Hydrocephalus: This is the type of hydrocephalus that develops at birth or in adulthood and is typically caused by injury or disease. […] Congenital Hydrocephalus: It is present at birth and may be caused by events that occur during fetal development or as a result of genetic abnormalities.

• #1 Hydrocephalus: What It Is, Causes, Symptoms, Diagnosis & Treatment

  https://my.clevelandclinic.org/health/diseases/17334-hydrocephalus

  Hydrocephalus can develop for a number of reasons. Hydrocephalus may be congenital or acquired. […] A combination of genetic and environmental factors during fetal development causes congenital hydrocephalus. Congenital means present at birth. The most common causes of congenital hydrocephalus are: Spina bifida and other brain and spinal cord (neural tube) defects. A narrowing of the small passage between the third and fourth ventricles of your brain (aqueductal stenosis). Complications of premature birth, such as bleeding within ventricles. Infections during pregnancy, such as rubella, that can cause inflammation in fetal brain tissue. […] Acquired hydrocephalus develops at any point after birth and can affect people of all ages. The most common causes of acquired hydrocephalus are: Head trauma. Stroke. Brain or spinal cord tumors. Meningitis or other infections of your brain or spinal cord. […] In addition, hemorrhage or complications of surgery may cause normal pressure hydrocephalus. Many people develop NPH without an obvious cause.

• #1 Congenital Hydrocephalus | Conditions | UCSF Benioff Children’s Hospitals

  https://www.ucsfbenioffchildrens.org/conditions/congenital-hydrocephalus

  The most common cause of congenital hydrocephalus is obstruction of the cerebral aqueduct, a long, narrow passageway between the brain’s third and fourth ventricles (cavities). This may result from an infection, hemorrhage, tumor or arachnoid cyst (an abnormal CSF-filled sac). […] Other medical problems sometimes associated with congenital hydrocephalus include: Chiari malformation. This is an abnormality in which part of the brain bulges through a natural opening in the base of the skull. […] Craniosynostosis. This is when the skull bones fuse together before the brain has stopped growing. […] Dandy-Walker syndrome. In this rare condition, parts of the cerebellum develop abnormally and the ventricle between the brainstem and the cerebellum is enlarged. […] Hydranencephaly. The brain’s cerebral hemispheres (the two halves of the largest part of the brain) are absent and replaced by sacs filled with CSF.

• #1 Hydrocephalus – Wikipedia

  https://en.wikipedia.org/wiki/Hydrocephalus

  Hydrocephalus can occur due to birth defects (primary) or can develop later in life (secondary). […] Hydrocephalus can be classified as primary or secondary (acquired) based on the cause. […] Primary hydrocephalus involves congenital, developmental, and genetic factors that lead to excess CSF build-up. […] Up to 50% of the causes of primary hydrocephalus are genetic. […] Congenital hydrocephalus is defined by the presence of excess CSF at birth. It occurs due to a combination of factors, especially genetic causes prior to birth. […] Developmental disorders including neural-tube defects, arachnoid cysts, Dandy-Walker malformations, and Arnold-Chiari malformations can cause primary hydrocephalus. […] Neural tube defects are commonly caused by a deficiency of folic acid during pregnancy.

• #1 Hydrocephalus – Causes, Types, Symptoms, Treatment & Complication PACE Hospitals – Best Hospitals in Hitech City, Hyderabad, India | Near Madhapur, Kukatpally, KPHB, Kondapur, Gachibowli, Jubilee Hills, Banjara HillsPACE Hospitals Contact

  https://www.pacehospital.com/hydrocephalus-causes-types-symptoms-treatment-complications

  Infections during pregnancy: Certain maternal or perinatal diseases, including Rubella virus, cytomegalovirus, Herpes simplex type 1 and 2 viruses, toxoplasma, other agents, and cytomegalovirus, may severely damage the placenta; as a result, these viruses can cross the placental barrier and develop hydrocephalus. […] Genetic factors: There is a connection between congenital hydrocephalus in humans and three mutant genes. The most well-known genetic connection is that X-linked hydrocephalus with aqueduct stenosis is caused by mutations in the L1CAM. other mutations and forms are far less understood. […] Traumatic brain injury (TBI): One major consequence that can arise following a traumatic brain injury (TBI) is post-traumatic hydrocephalus (PTH). PTH occurs as an accumulation of improperly drained cerebrospinal fluid (CSF) in the brain.

• #1 Hydrocephalus Causes

  https://hydrocephalus.allanach.dk/causes

  Hydrocephalus causes also include various types of cysts. […] Obstructive hydrocephalus is caused by many childhood tumours, since these often occur in the mid-line posterior fossa; the suprasellar region; the 3rd ventricle; and the pineal region. […] Postmeningitic and postinflammatory hydrocephalus are usually a communicating hydrocephalus due to obstruction at the basal cisterns. […] Vascular lesions can cause childhood hydrocephalus. […] Thrombosis of the dural sinuses can lead to hydrocephalus. […] A papilloma of the choroid plexus will increase the amount of CSF being produced. […] In-utero infection, which involves the central nervous system, can lead to impairment of CSF flow. […] Bickers-Adams syndrome is transmitted by a recessive gene of the X-chromosome. […] Achondroplasia dwarfism can also lead to hydrocephalus due to the fact that the skull develops abnormally, leading to the foramen magnum and spinal canal being abnormally narrow.

• #1 Hydrocephalus – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK560875/

  Prenatal hemorrhage or infection can cause hydrocephalus. Some genetic forms of hydrocephalus may not be evident at birth. […] Hydrocephalus had complex pathogenesis and multiple causes. […] There are four main types of hydrocephalus: obstructive, communicating, hypersecretory, and NPH. Hydrocephalus may be classified as congenital and acquired. […] Most tumors can obstruct the ventricular system and cause hydrocephalus. Removal of the tumor usually resolves the hydrocephalus.

• #1

  https://www.nhs.uk/conditions/hydrocephalus/causes/

  In many cases of congenital hydrocephalus the cause is unknown. […] Hydrocephalus that develops in children and adults (acquired hydrocephalus) is usually the result of an injury or illness. […] Possible causes of acquired hydrocephalus include: bleeding inside the brain for example, if blood leaks over the surface of the brain (subarachnoid haemorrhage), blood clots in the brain (venous thrombosis), meningitis an infection of the membranes surrounding the brain and spinal cord, brain tumours, head injury, stroke. […] Older people can sometimes develop normal pressure hydrocephalus (NPH) after a brain injury, bleeding in the brain or an infection. But it’s often not clear why NPH happens. […] It may be that NPH is linked to other underlying health conditions that affect the normal flow of blood for example, diabetes, heart disease, or having a high level of cholesterol in the blood.

• #1 Hydrocephalus – Causes, Types, Symptoms, Treatment & Complication PACE Hospitals – Best Hospitals in Hitech City, Hyderabad, India | Near Madhapur, Kukatpally, KPHB, Kondapur, Gachibowli, Jubilee Hills, Banjara HillsPACE Hospitals Contact

  https://www.pacehospital.com/hydrocephalus-causes-types-symptoms-treatment-complications

  Intracranial haemorrhage: Blood clots can obstruct the flow of cerebrospinal fluid in patients suffering from intracerebral haemorrhage (ICH), leading to acute hydrocephalus. […] Brain tumours: The natural flow of CSF may be obstructed by a brain tumour, causing it to accumulate in the brain instead of draining out. This may result in elevated intracranial pressure (ICP) or pressure inside the skull. […] Infections: Conditions like meningitis or ventriculitis can cause inflammation and scarring, disrupting CSF flow or absorption. […] Posterior fossa tumours: When cerebrospinal fluid (CSF) routes are obstructed at the cerebral aqueduct or fourth ventricle level, hydrocephalus results from posterior fossa tumours in these regions, there is no longer any CSF escape, leading to Triventricular hydrocephalus. […] In some cases, the causes mentioned above are also regarded as hydrocephalus risk factors.

• #1 Hydrocephalus – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/hydrocephalus/symptoms-causes/syc-20373604

  The central nervous system developed in a way that blocks the flow of cerebrospinal fluid. […] Bleeding occurred within the ventricles. This is a possible complication of premature birth. […] There was an infection in the uterus during pregnancy, such as rubella or syphilis. An infection can cause swelling in the brain tissues of an unborn baby. […] Other factors that can contribute to hydrocephalus among any age group include: […] Tumors of the brain or spinal cord. […] Central nervous system infections, such as bacterial meningitis or mumps. […] Bleeding in the brain from a stroke or head injury. […] Other traumatic injury to the brain.

• #1 Hydrocephalus Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/diseases-conditions/hydrocephalus

  Hydrocephalus is due to a problem with the flow of the fluid that surrounds the brain. This fluid is called the cerebrospinal fluid, or CSF. The fluid surrounds the brain and spinal cord and helps cushion the brain. […] Hydrocephalus may begin while the baby is growing in the womb. It is common in babies who have a myelomeningocele, a birth defect in which the spinal column does not close properly. […] Hydrocephalus may also be due to: Genetic defects, Certain infections during pregnancy. […] In young children, hydrocephalus may be due to: Infections that affect the central nervous system (such as meningitis or encephalitis), especially in infants. […] Hydrocephalus most often occurs in children. Another type, called normal pressure hydrocephalus, may occur in adults and older people.

• #1 Common Cause of Acquired Hydrocephalus

  https://www.hydroassoc.org/acquired-hydrocephalus/

  Acquired hydrocephalus develops after birth as a result of neurological conditions such as head trauma, brain tumor, cyst, intraventricular hemorrhage (brain bleed) or infection of the central nervous system. […] Head injury – A head injury or repeated head trauma can damage the brain’s tissues, nerves, or blood vessels. Blood from ruptured vessels may enter the CSF pathway, causing inflammation. Sites of CSF absorption might then be blocked by scarred membranes – meninges – or by blood cells. […] The CSF flow is restricted, and hydrocephalus develops. Severe head injuries can cause structural changes to the brain, resulting in the inability for fluid to pass freely through the ventricular system and causing hydrocephalus. […] Brain tumors – In children, brain tumors most commonly occur in the back of the brain which is referred to as the posterior fossa. As a tumor grows, it may fill or compress the fourth ventricle, blocking the flow of CSF and causing hydrocephalus. A tumor somewhere else in the brain might also block or compress the ventricular system.

• #1 Hydrocephalus – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK560875/

  Hydrocephalus is the symptomatic accumulation of cerebrospinal fluid inside the cerebral ventricles. It has complex pathogenesis and different causes. […] Obstructive hydrocephalus develops from a block in CSF pathways. The obstruction most commonly occurs at the foramina Monro, the aqueduct of Sylvius, the fourth ventricle, and foramen magnum, but most tumors with a significant size can obstruct at any point of CSF pathways. […] Communicating hydrocephalus is caused by impaired absorption of CSF. The most common causes are post hemorrhagic or post-inflammatory changes. […] Hypersecretory hydrocephalus is caused by an overproduction of CSF, most likely due to plexus papilloma or rarely a carcinoma. […] Normal-pressure hydrocephalus (NPH) is a type of communicating hydrocephalus with increased incidence in older age with a not fully understood pathogenesis.

• #1 Hydrocephalus Causes & Symptoms | Hydrocephalus Lawyer & Attorneys

  https://www.abclawcenters.com/practice-areas/hydrocephalus/

  Sometimes, babies with birth injuries develop a condition called hydrocephalus, which is characterized by excessive fluid in the brain. […] Hydrocephalus in newborns may be congenital or acquired. Congenital hydrocephalus can be caused by genetic abnormalities or complications during fetal development. Acquired hydrocephalus is caused by something that goes wrong during the birthing process or shortly after. Examples include: Birth trauma: If a baby is harmed due to excessive mechanical force during labor and delivery, this is called birth trauma or a traumatic birth injury. […] Because intracranial hemorrhages underlie many cases of acquired hydrocephalus, it is important to know the causes and risk factors for brain bleeds. These include the following: Prematurity: Premature babies often have a low birth weight and underdeveloped blood vessels, which can easily rupture due to injury. […] Hydrocephalus can also cause permanent brain damage and impact both cognitive and physical development when not timely diagnosed and treated.

• #1 Hydrocephalus Guide: Causes, Symptoms and Treatment Options

  https://www.drugs.com/health-guide/hydrocephalus.html

  Non-obstructive (communicating) hydrocephalus results from problems with cerebrospinal fluid being produced or absorbed. […] Another type of hydrocephalus, called normal pressure hydrocephalus, is an acquired type of communicating hydrocephalus in which the ventricles are enlarged but not under high pressure. Normal pressure hydrocephalus is seen in older adults. It may be the result of injury or illness, but in the majority of cases the cause is unknown. […] Premature infants born before 34 weeks or weighing less than 4 pounds have a higher risk of blood vessels bleeding in the brain. Severe bleeding can lead to acquired hydrocephalus, communicating or non-communicating, depending on the site and extent of the bleeding.

• #1 Hydrocephalus Symptoms, Causes and Surgical Treatments | MNC

  https://miamineurosciencecenter.com/en/conditions/hydrocephalus/

  Bleeding within the brain: In premature newborns, small blood vessels in the brains ventricles can hemorrhage, causing blockages or scar tissue. This can cause a build-up of CSF. […] Meningitis: This is an infection that damages the membranes protecting the brain and spinal cord, usually by a bacterial infection. […] Injury to the head: Trauma to the head can cause damage to tissues and blood vessels, which can lead to a build-up of CSF. […] Certain types of brain tumor: In infants, if brain tumors occur, they typically develop in the back of the brain. This type of tumor may cause hydrocephalus by blocking the brains fourth ventricle. […] In many cases of normal-pressure hydrocephalus, the cause is not known (idiopathic). In other cases, it may be due to brain injury, certain types of tumors, inflammation, or an infection. […] Hydrocephalus ex vacuo is caused when the brain has been damaged due to trauma or stroke.

• #1 Normal Pressure Hydrocephalus (NPH): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/15849-normal-pressure-hydrocephalus-nph

  Normal pressure hydrocephalus (NPH) happens when a slow buildup of cerebrospinal fluid on your skull presses on your brain. […] NPH happens because of cerebrospinal fluid (CSF) buildup in your brain. […] Primary NPH means it isnt happening because of another medical condition. Another word for this is idiopathic, a term experts use for conditions that happen for unknown reasons. […] Secondary NPH happens when another medical condition affects how your body makes, circulates or reabsorbs CSF. Some examples of conditions that can cause secondary NPH include: Brain aneurysm, Bleeding in or around your brain, Brain tumors, Infections of the brain or related areas of your nervous system, Stroke, Traumatic brain injuries. […] Experts suspect idiopathic NPH can involve one or more age-related issues with how your body makes, circulates and reabsorbs CSF. […] Theres also evidence that NPH might have a connection to degenerative brain conditions like Alzheimers disease, Lewy body dementia or similar conditions. Researchers are continuing to explore exactly how and why NPH happens and whether or not other conditions can contribute to it.

• #1 What Causes Normal Pressure Hydrocephalus? – Barrow Neurological Institute

  https://www.barrowneuro.org/for-physicians-researchers/education/grand-rounds-publications-media/barrow-quarterly/volume-19-no-2-2003/causes-normal-pressure-hydrocephalus/

  The NPH in such cases has a distinct cause and is distinct from idiopathic NPH in which the cause is unknown. […] The point of obstruction can be at the level of the aqueduct of Sylvius, outlet foramen of the fourth ventricle, or basal cisterns. […] This phase results from the new expansion of the ventricles as the brain softens, an inevitable part of the normal process of aging.

• #1 What Causes Normal Pressure Hydrocephalus? – Barrow Neurological Institute

  https://www.barrowneuro.org/for-physicians-researchers/education/grand-rounds-publications-media/barrow-quarterly/volume-19-no-2-2003/causes-normal-pressure-hydrocephalus/

  Originally described in the mid1960s, normal pressure hydrocephalus (NPH) is a condition found mainly in elderly patients. […] The cause of the condition has been the subject of considerable speculation, and a consensus remains elusive. […] The findings suggest that a long-standing increase in and concomitant prolonged compensation for resistance to the flow of cerebrospinal fluid from its point of production to its points of absorption may be the mechanism underlying NPH. […] The normal process of aging can lead to softening of the brain or to a decrease in brain turgor, and this chronic compensated condition likely leads to decompensation and symptomatic deterioration. […] NPH was modeled by making two assumptions. First, turgor of the brain diminishes as a result of the normal process of aging. Second, as suggested by Di Rocco and coworkers in a study discussed in the section on the pathology of NPH, resistance to the flow of CSF between the spinal subarachnoid and the cortical subarachnoid spaces must be increased.

• #1 Hydrocephalus – AANS

  https://www.aans.org/patients/conditions-treatments/hydrocephalus/

  Communicating Hydrocephalus: This type of hydrocephalus occurs when there is no obstruction to the flow of CSF within the ventricular system. The condition arises either due to inadequate absorption or due to an abnormal increase in the quantity of CSF produced. […] Non-communication (Obstructive) Hydrocephalus: It occurs when the flow of CSF is blocked along one of more of the passages connecting the ventricles, causing enlargement of the pathways upstream of the block and leading to an increase in pressure within the skull. […] Normal Pressure Hydrocephalus: It is a form of communicating hydrocephalus that can occur at any age, but is most common in the elderly. It is characterized by dilated ventricles with normal pressure within the spinal column. […] Hydrocephalus Ex-vacuo: It primarily affects adults and occurs when a degenerative disease, like Alzheimers disease, stroke or trauma, causes damage to the brain that may cause the brain tissue to shrink.

• #1 Hydrocephalus | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/hydrocephalus

  Hydrocephalus may be present at or shortly after birth or may result over time from damage or injury. […] In these cases, some causes of hydrocephalus include: inherited genetic abnormalities that block the flow of CSF, developmental disorders such as those associated with birth disorders in the brain or spinal cord, complications of premature birth such as bleeding within the ventricles, and infection during pregnancy such as rubella that can cause inflammation in fetal brain tissue. […] Certain factors can increase the risk of developing hydrocephalus at any age, including: brain or spinal cord tumors, infections of the central nervous system such as bacterial meningitis, and injury or stroke that causes bleeding in the brain. […] NPH can result from bleeding in the brain’s CSF (also known as subarachnoid or intraventricular hemorrhage), head trauma, infection, tumor, or a complication of surgery. However, many people develop NPH when none of these factors are present. […] Hydrocephalus also may happen when something blocks the flow of CSF along one or more of the narrow passages connecting the ventricles. […] Hydrocephalus may happen when something blocks the flow of CSF after it exits the ventricles. […] Hydrocephalus can happen in children and adults.

• #1 Hydrocephalus: Symptoms, Causes, Types, Diagnosis, Treatment

  https://www.webmd.com/brain/hydrocephalus-facts

  Hydrocephalus happens most often in infants or in adults older than 60, but you can have it at any age. […] The three main causes of hydrocephalus are: […] A blockage. Tumors, cysts, birth defects, brain injury, or stroke can block or affect the normal flow of cerebrospinal fluid. […] Poor fluid absorption. Inflammation, injuries, or infections like bacterial meningitis can keep your brain tissues from taking in cerebrospinal fluid. […] Too much fluid. In rare cases, your body makes more cerebrospinal fluid than your brain can handle, often due to infection like meningitis.

• #1 What causes hydrocephalus? | Hydrocephalus and Young People | SBH Scotland

  https://www.hydrocephalusscotland.org.uk/content/what-causes-hydrocephalus/

  Most babies born with spina bifida also have Hydrocephalus. This is because, as well as problems with the spinal cord, certain parts of the brain do not develop the way they should before birth. This prevents proper drainage of the CSF which causes a collection of fluid and increased pressure in the brain. This can compress the abnormal parts of the brain (the bits affected by spina bifida) even further. […] Babies born prematurely are at risk of developing Hydrocephalus. When a baby is born early, its brain is still developing at the time of birth. This makes it far more vulnerable than the brain of a baby that goes to full term. […] Other forms of brain haemorrhage, including those occurring in adults (’stroke’) can cause blockages to the flow of CSF. This might result in post-haemorrhagic Hydrocephalus.

• #1 Hydrocephalus > Fact Sheets > Yale Medicine

  https://www.yalemedicine.org/conditions/hydrocephalus

  A condition that causes excess fluid to build up in and around the brain. […] Risk factors include age, infection during pregnancy, family history, or head injuries. […] The exact cause of normal pressure hydrocephalus isn’t well understood. […] Hydrocephalus may also be a result of bleeding, infections, head trauma, tumors, or cysts. […] The risk of hydrocephalus in children is increased if a pregnant woman contracts an infection during pregnancy. […] Other risk factors are a family history of hydrocephalus and head injuries suffered during childbirth or in childhood.

• #1 Hydrocephalus – Symptoms, Causes, Treatments

  https://resources.healthgrades.com/right-care/brain-and-nerves/hydrocephalus

  Hydrocephalus results from an imbalance between the formation of cerebrospinal fluid and its absorption. The cause of this is not always known. […] In some cases, hydrocephalus can occur with other birth defects such as spina bifida (incomplete closure of the spinal cord) or it may be related to genetic abnormalities, infection, or trauma. Premature babies who have cerebral hemorrhage (bleeding in the brain) may develop hydrocephalus. Sometimes it can occur as a result of a tumor that blocks the flow of cerebrospinal fluid. […] A number of factors increase the risk of developing hydrocephalus. Not all people with risk factors will get hydrocephalus. Risk factors for hydrocephalus include: Abnormalities of brain development and formation, Brain or spinal cord injury, Brain or spinal cord tumors, Family history, Inadequate maternal folic acid consumption (neural tube defects occur in fetus), Meningitis (infection or inflammation of the sac around the brain and spinal cord) or other brain infection, Prenatal infection, Preterm birth, Spina bifida (incomplete closure of the spinal cord).

• #1 Hydrocephalus: Symptoms, Causes, and TreatmentHealthline

  https://www.healthline.com/health/hydrocephalus

  This condition can also occur in infants, toddlers, and older children due to: central nervous system infections like meningitis, especially in babies, bleeding in the brain during or shortly after delivery, especially in babies born prematurely, injuries that occur before, during, or after delivery, head trauma, central nervous system tumors. […] When hydrocephalus occurs in adults (usually those over 60 years of age), CSF levels rise, but the amount of pressure is usually normal. But it still causes the brain to swell and can lead to impaired functioning. In adults, this condition usually results from conditions that prevent CSF from flowing. […] But in some cases, there’s no known cause. You might be at higher risk if you’ve experienced any of the following: brain-related infections like meningitis, head injuries, bleeding from a blood vessel in your brain, brain surgery.

• #1 Hydrocephalus in Infants | Symptoms, Causes & Treatments

  https://www.childbirthinjuries.com/birth-injury/hydrocephalus/

  Hydrocephalus in infants is often congenital. However, it can also develop shortly after due to complications that affect the flow of cerebrospinal fluid through the brain. […] Risk factors and hydrocephalus causes in babies may include: Aqueductal stenosis (narrowing of a passage in the brain), Birth injuries involving head trauma or swelling, Bleeding in the brain, such as intraventricular hemorrhage, Brain malformations, tumors, or cysts, Maternal infections, Meningitis or other brain infections, Premature birth, Spina bifida (opening to the spine) or spinal cord defects. […] In some cases, hydrocephalus develops after a difficult delivery. Improper use of tools like forceps or vacuum extractors may cause head trauma that disrupts normal CSF flow. When that happens, medical negligence may be to blame.

• #1 Hydrocephalus | Radiology Reference Article | Radiopaedia.org

  https://radiopaedia.org/articles/hydrocephalus?lang=us

  Hydrocephalus denotes an increase in the volume of CSF, causing the distension of cerebral ventricles (ventriculomegaly) due to insufficient passage of the CSF from its point of production in the ventricles into the systemic circulation, whether that be via resorption into the dural venous sinuses or via the glymphatic pathway 7. […] Types of hydrocephalus are as follows (see figures 1 and 2): […] non-communicating (i.e. CSF cannot exit the ventricular system, and thus there is by definition obstruction to CSF absorption) […] numerous causes including 8: […] although it is widely believed that defective absorption of CSF at the arachnoid granulation is the cause of communicating hydrocephalus; however, obstruction between spinal subarachnoid space and basal cisterns or between the basal cisterns and arachnoid villi are more common.

• #1 Hydrocephalus – Wikipedia

  https://en.wikipedia.org/wiki/Hydrocephalus

  Secondary hydrocephalus is acquired as a consequence of CNS infections, meningitis, brain tumors, head trauma, toxoplasmosis, or intracranial hemorrhage. […] Intraventricular hemorrhage, or bleeding within the ventricles of the brain, leads to hydrocephalus in 51-89% of patients. […] Hydrocephalus can also be caused by overproduction of CSF (relative obstruction). […] Brain atrophy or breakdown in elderly patients or patients with conditions like Parkinson’s or Alzheimer’s can lead to acquired hydrocephalus.

• #1 Loss of Rsph9 causes neonatal hydrocephalus with abnormal development of motile cilia in mice | Scientific Reports

  https://www.nature.com/articles/s41598-020-69447-4

  Hydrocephalus is a brain disorder triggered by cerebrospinal fluid accumulation in brain cavities. […] Here, we show that deletion of the Rsph9 gene leads to the development of hydrocephalus in the early postnatal period. […] In addition, hydrocephalus in Rsph9/ mice results in the development of astrogliosis, microgliosis and cerebrovascular abnormalities. […] Our results collectively suggested that RSPH9 is essential for ciliary structure and motility of mouse ependymal cilia, and its deletion causes the pathogenesis of hydrocephalus. […] Hydrocephalus is a prevalent birth defect triggered by excessive accumulation of cerebrospinal fluid (CSF) in brain cavities. […] The directional flow of CSF is driven by continuous CSF secretion and by the orchestrated beating of bundles of motile cilia that are located at the apical surface of ependymal cells.

• #1 Hydrocephalus | MedLink Neurology

  https://www.medlink.com/articles/hydrocephalus

  Acute hydrocephalus is a life-threatening condition that is usually treatable with prompt surgical intervention. […] There are many causes of hydrocephalus, including aqueductal stenosis, congenital anomalies, tumors, infection, hemorrhage, and inflammatory diseases. […] Etiology plays the most important role in determining the presentation of hydrocephalus. […] There are multiple causes of hydrocephalus. Any condition that alters normal CSF dynamics to cause increased intracranial pressure is a cause of hydrocephalus. […] Traditionally, they are divided into obstructive and communicating hydrocephalus. […] Obstructive causes include any lesion that can prevent the normal progress of CSF flow, causing increased pressure proximal to the lesion. […] Communicating hydrocephalus is most commonly attributed to inadequate function of the arachnoid granulations for CSF absorption.

• #1 Hydrocephalus | MedLink Neurology

  https://www.medlink.com/articles/hydrocephalus

  The pathogenesis and pathophysiology of hydrocephalus encompasses the anatomic, biochemical, and physiologic abnormalities that can result in an increased accumulation of CSF. […] Many classification systems for the etiology of hydrocephalus have as their main branch point a separation between congenital cases and other causes, such as inflammatory or neoplastic. […] The issue is really whether the cause of the hydrocephalus is a malformation (such as Chiari malformation), a genetic process (such as X-linked or autosomal recessive types), inflammation of either the leptomeninges or ventricular lining, chemical irritation (such as subarachnoid or ventricular blood), or neoplasm. […] The site of the blockade is often helpful in narrowing the search for causes of the hydrocephalus.

• #1 Pediatric hydrocephalus – Children’s Health Neurosurgery

  https://www.childrens.com/specialties-services/conditions/hydrocephalus

  Hydrocephalus can permanently damage the brain, leading to severe problems with mental and physical development. […] Congenital hydrocephalus is present at birth. It can be the result of some diseases the mother had during pregnancy, such as rubella. There can be a hereditary reason passed down in families. In other cases, a failure of the spine to close entirely occurs. […] Acquired hydrocephalus develops at birth or sometime after. Instead of being present at birth, it comes from injuries or illnesses such as infections of the brain and spinal column (meningitis), bleeding from burst blood vessels in the brain, severe head injuries, brain tumors or cysts. Acquired hydrocephalus can also occur spontaneously. […] What causes hydrocephalus is not well known. It has been linked to genetic abnormalities and things that go wrong during development in the womb. It can be seen as a complication of premature birth such as bleeding inside the brain and diseases including meningitis and traumatic head injury (TBI).

• #1 Normal Pressure Hydrocephalus in Adult Mice Causes Gait Impairment, Cognitive Deficits, and Urinary Frequency with Incontinence | eNeuro

  https://www.eneuro.org/content/11/11/ENEURO.0412-24.2024

  Normal pressure hydrocephalus (NPH) is marked by enlarged cerebral ventricles with normal intracranial pressure, plus three stereotypical symptoms: gait impairment, cognitive dysfunction, and urinary frequency with urge incontinence. […] The pathophysiology and neural circuit mechanisms of NPH symptoms remain unknown, and there are no effective treatments for shunt-resistant symptoms. […] Importantly, while some studies have tested gait and cognitive function, none have assessed the third characteristic symptom, micturition. […] An ideal NPH model would include chronically enlarged cerebral ventricles with normal CSF pressure in adult animals, plus one or more of the characteristic NPH symptoms. […] This mouse model, with symptoms resembling human NPH, can be combined with molecular-genetic tools in any mouse strain to explore the neural circuit mechanisms of these symptoms.

• #2 Hydrocephalus: Causes, Symptoms | Tampa General Hospital

  https://www.tgh.org/institutes-and-services/conditions/hydrocephalus

  Hydrocephalus is characterized by an abnormal amount of cerebrospinal fluid (CSF) in the brains deep-seeded cavities, or ventricles. […] Hydrocephalus occurs when this absorption process is disrupted by one of the following: […] Obstruction from a blocked or narrowed ventricle […] Overproduction of CSF […] Poor filtration due to brain inflammation, injury or disease.

• #2 Hydrocephalus: Overview, Causes, Diagnosis and Treatment

  https://www.nationwidechildrens.org/conditions/hydrocephalus

  Hydrocephalus can be caused by a blockage in the flow or reabsorption of CSF, causing extra fluid to build up. […] On rare occasions, hydrocephalus is caused by the body making too much CSF. […] Hydrocephalus can be congenital, meaning that it happens before your baby is born. Some reasons for too much cerebral spinal fluid (CSF) in the brain include: The flow of cerebral spinal fluid is blocked, The cerebral spinal fluid does not get absorbed into the blood properly, The brain makes too much of cerebral spinal fluid. […] Hydrocephalus can affect the brain and your baby’s development. The extent of the problem depends on the severity of the hydrocephalus, and the presence of other problems such as genetic defects, certain infections during pregnancy, bleeding inside the head, tumors in the brain or spinal cord, injury, prematurity, and abnormalities of brain development.

• #2 Hydrocephalus – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK560875/

  Hydrocephalus is the symptomatic accumulation of cerebrospinal fluid inside the cerebral ventricles. It has complex pathogenesis and different causes. […] Obstructive hydrocephalus develops from a block in CSF pathways. The obstruction most commonly occurs at the foramina Monro, the aqueduct of Sylvius, the fourth ventricle, and foramen magnum, but most tumors with a significant size can obstruct at any point of CSF pathways. […] Communicating hydrocephalus is caused by impaired absorption of CSF. The most common causes are post hemorrhagic or post-inflammatory changes. […] Hypersecretory hydrocephalus is caused by an overproduction of CSF, most likely due to plexus papilloma or rarely a carcinoma. […] Normal-pressure hydrocephalus (NPH) is a type of communicating hydrocephalus with increased incidence in older age with a not fully understood pathogenesis.

• #2 Hydrocephalus Causes, Symptoms, Diagnosis and Treatment – Cura4U

  https://cura4u.com/conditions/hydrocephalus

  The accumulation of fluid in the cavities (ventricles) deep within the brain is known as hydrocephalus. […] An imbalance between the amount of cerebrospinal fluid produced and the amount absorbed into the blood causes hydrocephalus. […] One of the following factors can cause too much cerebrospinal fluid in the ventricles: […] Obstruction: A partial blockage of cerebrospinal fluid flow, either from one ventricle to the next or from the ventricles to other spaces. […] Poor absorption: A problem absorbing cerebrospinal fluid is less common. This is often linked to inflammation of brain structures due to injury or disease. […] Overproduction: Cerebrospinal fluid is sometimes produced faster than it can be absorbed. […] Hydrocephalus can be congenital (present at birth) or develop shortly after birth due to any of the following factors:

• #2 Hydrocephalus – Wikipedia

  https://en.wikipedia.org/wiki/Hydrocephalus

  Hydrocephalus can occur due to birth defects (primary) or can develop later in life (secondary). […] Hydrocephalus can be classified as primary or secondary (acquired) based on the cause. […] Primary hydrocephalus involves congenital, developmental, and genetic factors that lead to excess CSF build-up. […] Up to 50% of the causes of primary hydrocephalus are genetic. […] Congenital hydrocephalus is defined by the presence of excess CSF at birth. It occurs due to a combination of factors, especially genetic causes prior to birth. […] Developmental disorders including neural-tube defects, arachnoid cysts, Dandy-Walker malformations, and Arnold-Chiari malformations can cause primary hydrocephalus. […] Neural tube defects are commonly caused by a deficiency of folic acid during pregnancy.

• #2 Pediatric hydrocephalus – Children’s Health Neurosurgery

  https://www.childrens.com/specialties-services/conditions/hydrocephalus

  Hydrocephalus can permanently damage the brain, leading to severe problems with mental and physical development. […] Congenital hydrocephalus is present at birth. It can be the result of some diseases the mother had during pregnancy, such as rubella. There can be a hereditary reason passed down in families. In other cases, a failure of the spine to close entirely occurs. […] Acquired hydrocephalus develops at birth or sometime after. Instead of being present at birth, it comes from injuries or illnesses such as infections of the brain and spinal column (meningitis), bleeding from burst blood vessels in the brain, severe head injuries, brain tumors or cysts. Acquired hydrocephalus can also occur spontaneously. […] What causes hydrocephalus is not well known. It has been linked to genetic abnormalities and things that go wrong during development in the womb. It can be seen as a complication of premature birth such as bleeding inside the brain and diseases including meningitis and traumatic head injury (TBI).

• #2 Congenital Hydrocephalus | Conditions | UCSF Benioff Children’s Hospitals

  https://www.ucsfbenioffchildrens.org/conditions/congenital-hydrocephalus

  The most common cause of congenital hydrocephalus is obstruction of the cerebral aqueduct, a long, narrow passageway between the brain’s third and fourth ventricles (cavities). This may result from an infection, hemorrhage, tumor or arachnoid cyst (an abnormal CSF-filled sac). […] Other medical problems sometimes associated with congenital hydrocephalus include: Chiari malformation. This is an abnormality in which part of the brain bulges through a natural opening in the base of the skull. […] Craniosynostosis. This is when the skull bones fuse together before the brain has stopped growing. […] Dandy-Walker syndrome. In this rare condition, parts of the cerebellum develop abnormally and the ventricle between the brainstem and the cerebellum is enlarged. […] Hydranencephaly. The brain’s cerebral hemispheres (the two halves of the largest part of the brain) are absent and replaced by sacs filled with CSF.

• #2

  https://www.nhs.uk/conditions/hydrocephalus/causes/

  The causes of hydrocephalus (excess fluid in the brain) are poorly understood. […] It’s thought hydrocephalus present at birth (congenital hydrocephalus) may be the result of a brain defect restricting the flow of cerebrospinal fluid (CSF). […] Hydrocephalus that develops in adults and children (acquired hydrocephalus) is often caused by an illness or injury that affects the brain. […] Hydrocephalus that develops in older people (normal pressure hydrocephalus) may also be the result of an infection, illness or injury, but in many cases it’s not clear what causes the condition. […] Hydrocephalus present at birth (congenital hydrocephalus) can be caused by certain health conditions, such as spina bifida. […] Some premature babies have bleeding in the brain, which can block the flow of CSF and cause hydrocephalus.

• #2 Hydrocephalus: Practice Essentials, Background, Pathophysiology

  https://emedicine.medscape.com/article/1135286-overview

  Congenital hydrocephalus applies to the ventriculomegaly that develops in the fetal and infancy periods, often associated with macrocephaly. The most common causes of congenital hydrocephalus are obstruction of the cerebral aqueduct flow, Arnold-Chiari malformation or Dandy-Walker malformation. […] Normal pressure hydrocephalus (NPH) is a rare condition characterized by abnormal gait, urinary incontinence, and (potentially reversible) dementia. It can occur in persons of any age but is most common in older adults.

• #2 Hydrocephalus Causes

  https://hydrocephalus.allanach.dk/causes

  There are a number of hydrocephalus causes all of which are either developmental or genetic. […] Blockage of cerebrospinal fluid (CSF) can be caused by a variety of conditions such as: spina bifida and other birth defects of the brain; certain brain infections like meningitis (pus can cause a blockage); haemorrhage within or around the brain, usually due to prematurity or a ruptured aneurysm; and brain trauma, or tumouhyrors. […] The term congential refers to cases where hydrecephalus is present at birth, but without any genetic factors. […] Cases of hydrocephalus which are caused by aqueduct stenosis are usually present at birth, or develope soon there after. […] Chiari malformations (CM) are a group of disorders in which cerebellar tonsils protrude into the foramen of Magendie, thereby blocking the CSF flow between the ventricles and the spine.

• #2 Hydrocephalus FAQs – Pediatric Neurosurgery | UCLA Health

  https://www.uclahealth.org/medical-services/pediatric-neurosurgery/conditions-treatment/pediatric-hydrocephalus-program/hydrocephalus-faqs

  Hydrocephalus can be present at birth or be acquired later in life as a result of a tumor, head injury, meningitis or hemorrhage. […] The most common causes of pediatric hydrocephalus in children in the United States are brain bleeds as a result of prematurity, spina bifida, brain tumors, infection and head injury. Acquired hydrocephalus is caused by head injury or an obstruction in the brain, such as a tumor. […] Congenital hydrocephalus can run in families. It is thought that congenital hydrocephalus can be caused by genetic defects that can be passed from one or both parents to a child, but the direct links to hereditary disorders are still being investigated. However, experts have found a connection between a rare genetic disorder called L1 syndrome and hydrocephalus. L1 syndrome is the result of mutated gene. It can cause a condition known as aqueductal stenosis, which involves an obstruction of the flow of cerebrospinal fluid (CSF), which is a fluid that is necessary for the normal functioning of the brain and spinal cord. This obstruction of the CSF can cause hydrocephalus. Researchers estimate that L1 syndrome occurs in one in 25,000 to 60,000 males and rarely occurs in females.

• #2 Hydrocephalus: What It Is, Causes, Symptoms, Diagnosis & Treatment

  https://my.clevelandclinic.org/health/diseases/17334-hydrocephalus

  Hydrocephalus can develop for a number of reasons. Hydrocephalus may be congenital or acquired. […] A combination of genetic and environmental factors during fetal development causes congenital hydrocephalus. Congenital means present at birth. The most common causes of congenital hydrocephalus are: Spina bifida and other brain and spinal cord (neural tube) defects. A narrowing of the small passage between the third and fourth ventricles of your brain (aqueductal stenosis). Complications of premature birth, such as bleeding within ventricles. Infections during pregnancy, such as rubella, that can cause inflammation in fetal brain tissue. […] Acquired hydrocephalus develops at any point after birth and can affect people of all ages. The most common causes of acquired hydrocephalus are: Head trauma. Stroke. Brain or spinal cord tumors. Meningitis or other infections of your brain or spinal cord. […] In addition, hemorrhage or complications of surgery may cause normal pressure hydrocephalus. Many people develop NPH without an obvious cause.

• #2 5 Symptoms and Causes of Hydrocephalus : Desh Sahni, M.D.: Neurosurgeon

  https://www.bspine.com/blog/5-symptoms-and-causes-of-hydrocephalus

  Hydrocephalus is either congenital or acquired and largely affects infants or adults over the age of 60. […] The reason for the higher prevalence in infants and toddlers is complicated and can stem from anything from spina bifida or an infection during pregnancy. […] The increased risk for adults over the age of 60 is largely due to stroke, Alzheimers disease, injury, or any condition that causes the brain to shrink.

• #2 Common Cause of Acquired Hydrocephalus

  https://www.hydroassoc.org/acquired-hydrocephalus/

  Intraventricular hemorrhage – An intraventricular hemorrhage, which most frequently affects premature newborns, may cause an acquired form of hydrocephalus. When small blood vessels alongside the ventricular lining rupture, blood may block or scar the ventricles or plug the arachnoid villi, which allow CSF to be absorbed. When the CSF can’t be absorbed, hydrocephalus results. […] Meningitis – Meningitis is an inflammation of the membranes of the brain and spinal cord. Caused by a bacterial or (less frequently) viral infection, meningitis can scar the delicate membranes called meninges that line the CSF pathway. An acquired form of hydrocephalus may develop if this scarring obstructs the flow of CSF as it passes through the narrow ventricles or over the surfaces of the brain in the subarachnoid space.

• #2 Hydrocephalus | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/hydrocephalus

  Hydrocephalus may be present at or shortly after birth or may result over time from damage or injury. […] In these cases, some causes of hydrocephalus include: inherited genetic abnormalities that block the flow of CSF, developmental disorders such as those associated with birth disorders in the brain or spinal cord, complications of premature birth such as bleeding within the ventricles, and infection during pregnancy such as rubella that can cause inflammation in fetal brain tissue. […] Certain factors can increase the risk of developing hydrocephalus at any age, including: brain or spinal cord tumors, infections of the central nervous system such as bacterial meningitis, and injury or stroke that causes bleeding in the brain. […] NPH can result from bleeding in the brain’s CSF (also known as subarachnoid or intraventricular hemorrhage), head trauma, infection, tumor, or a complication of surgery. However, many people develop NPH when none of these factors are present. […] Hydrocephalus also may happen when something blocks the flow of CSF along one or more of the narrow passages connecting the ventricles. […] Hydrocephalus may happen when something blocks the flow of CSF after it exits the ventricles. […] Hydrocephalus can happen in children and adults.

• #2

  https://www.aurorahealthcare.org/services/neuroscience/brain-skull-base-care/hydrocephalus

  When the normal flow of CSF is blocked, it may lead to a condition called hydrocephalus or water on the brain. […] Hydrocephalus can be present at birth, leading to the hallmark symptom of an enlarged or bulging head in newborns. Older children and adults can also develop a type of hydrocephalus from a traumatic brain injury or illness. […] Depending on the type, a combination of genetic and health factors may cause the condition. Hydrocephalus can be congenital (present at birth) or acquired (occurs after birth). […] Common causes of congenital hydrocephalus: Cerebral aqueduct stenosis, which narrows the third and fourth ventricles in the brain; Spina bifida, which affects the brain and spine, causing a neural tube defect (encephalocele); Intraventricular hemorrhage (IVH) that causes bleeding in the ventricles, which can result from premature birth complications; Infections during pregnancy that cause inflammation in fetal brain tissue, such as rubella or syphilis. […] Common causes of acquired hydrocephalus: Stroke or injury, leading to bleeding in the brain; Bacterial meningitis or mumps, which affect nervous system function; Brain hemorrhage; Brain tumors; Spinal cord tumors; Traumatic brain injuries (TBI).

• #2 Hydrocephalus – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK560875/

  Prenatal hemorrhage or infection can cause hydrocephalus. Some genetic forms of hydrocephalus may not be evident at birth. […] Hydrocephalus had complex pathogenesis and multiple causes. […] There are four main types of hydrocephalus: obstructive, communicating, hypersecretory, and NPH. Hydrocephalus may be classified as congenital and acquired. […] Most tumors can obstruct the ventricular system and cause hydrocephalus. Removal of the tumor usually resolves the hydrocephalus.

• #2 Hydrocephalus – Causes, Types, Symptoms, Treatment & Complication PACE Hospitals – Best Hospitals in Hitech City, Hyderabad, India | Near Madhapur, Kukatpally, KPHB, Kondapur, Gachibowli, Jubilee Hills, Banjara HillsPACE Hospitals Contact

  https://www.pacehospital.com/hydrocephalus-causes-types-symptoms-treatment-complications

  Intracranial haemorrhage: Blood clots can obstruct the flow of cerebrospinal fluid in patients suffering from intracerebral haemorrhage (ICH), leading to acute hydrocephalus. […] Brain tumours: The natural flow of CSF may be obstructed by a brain tumour, causing it to accumulate in the brain instead of draining out. This may result in elevated intracranial pressure (ICP) or pressure inside the skull. […] Infections: Conditions like meningitis or ventriculitis can cause inflammation and scarring, disrupting CSF flow or absorption. […] Posterior fossa tumours: When cerebrospinal fluid (CSF) routes are obstructed at the cerebral aqueduct or fourth ventricle level, hydrocephalus results from posterior fossa tumours in these regions, there is no longer any CSF escape, leading to Triventricular hydrocephalus. […] In some cases, the causes mentioned above are also regarded as hydrocephalus risk factors.

• #2 Hydrocephalus Causes

  https://hydrocephalus.allanach.dk/causes

  Hydrocephalus causes also include various types of cysts. […] Obstructive hydrocephalus is caused by many childhood tumours, since these often occur in the mid-line posterior fossa; the suprasellar region; the 3rd ventricle; and the pineal region. […] Postmeningitic and postinflammatory hydrocephalus are usually a communicating hydrocephalus due to obstruction at the basal cisterns. […] Vascular lesions can cause childhood hydrocephalus. […] Thrombosis of the dural sinuses can lead to hydrocephalus. […] A papilloma of the choroid plexus will increase the amount of CSF being produced. […] In-utero infection, which involves the central nervous system, can lead to impairment of CSF flow. […] Bickers-Adams syndrome is transmitted by a recessive gene of the X-chromosome. […] Achondroplasia dwarfism can also lead to hydrocephalus due to the fact that the skull develops abnormally, leading to the foramen magnum and spinal canal being abnormally narrow.

• #2 What causes hydrocephalus? | Hydrocephalus and Young People | SBH Scotland

  https://www.hydrocephalusscotland.org.uk/content/what-causes-hydrocephalus/

  This is an infection of the membranes covering the brain. The inflammation and debris from this infection may block the drainage pathways of CSF and could result in Hydrocephalus. […] In these cases, Hydrocephalus is often due to pressure on the surrounding tissues by the enlarging cyst. […] Tumours of the brain cause compression and swelling of surrounding tissues resulting in poor drainage of CSF. […] In very rare circumstances, Hydrocephalus is due to hereditary factors which might affect future generations. There are many other very rare causes of hydrocephalus, and sometimes it is unknown why it has happened. […] Cerebral palsy is not a cause of hydrocephalus but may occur alongside it. Cerebral palsy can also be associated with brain trauma before or after birth from a haemorrhage or meningitis, for example. Co-occurrence of hydrocephalus and cerebral palsy can increase the type and severity of difficulties experienced.

• #2 Common Cause of Acquired Hydrocephalus

  https://www.hydroassoc.org/acquired-hydrocephalus/

  Acquired hydrocephalus develops after birth as a result of neurological conditions such as head trauma, brain tumor, cyst, intraventricular hemorrhage (brain bleed) or infection of the central nervous system. […] Head injury – A head injury or repeated head trauma can damage the brain’s tissues, nerves, or blood vessels. Blood from ruptured vessels may enter the CSF pathway, causing inflammation. Sites of CSF absorption might then be blocked by scarred membranes – meninges – or by blood cells. […] The CSF flow is restricted, and hydrocephalus develops. Severe head injuries can cause structural changes to the brain, resulting in the inability for fluid to pass freely through the ventricular system and causing hydrocephalus. […] Brain tumors – In children, brain tumors most commonly occur in the back of the brain which is referred to as the posterior fossa. As a tumor grows, it may fill or compress the fourth ventricle, blocking the flow of CSF and causing hydrocephalus. A tumor somewhere else in the brain might also block or compress the ventricular system.

• #2 Hydrocephalus: Types, Causes, Diagnosis, Treatment, etc.

  https://www.verywellhealth.com/hydrocephalus-6890496

  Hydrocephalus has many potential causes, depending on the type. […] Congenital hydrocephalus can be caused by inherited genetic abnormalities or developmental disorders affecting the brain’s CSF flow. […] Acquired hydrocephalus in babies is most commonly caused by a brain bleed, often due to prematurity. […] Other causes of hydrocephalus in babies include: Brain tumor or infection, usually bacterial meningitis (infection of the membranes that surround the brain/spinal cord). […] Normal pressure hydrocephalus may be caused by a brain bleed or tumor, head trauma, or meningitis. In around half of NPH cases, the cause remains unknown. […] Hydrocephalus ex-vacuo is usually caused by a stroke or an injury to the brain. It may also occur in older individuals whose brain shrinks with age or in those with Alzheimer’s disease.

• #2 Normal Pressure Hydrocephalus (NPH): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/15849-normal-pressure-hydrocephalus-nph

  Normal pressure hydrocephalus (NPH) happens when a slow buildup of cerebrospinal fluid on your skull presses on your brain. […] NPH happens because of cerebrospinal fluid (CSF) buildup in your brain. […] Primary NPH means it isnt happening because of another medical condition. Another word for this is idiopathic, a term experts use for conditions that happen for unknown reasons. […] Secondary NPH happens when another medical condition affects how your body makes, circulates or reabsorbs CSF. Some examples of conditions that can cause secondary NPH include: Brain aneurysm, Bleeding in or around your brain, Brain tumors, Infections of the brain or related areas of your nervous system, Stroke, Traumatic brain injuries. […] Experts suspect idiopathic NPH can involve one or more age-related issues with how your body makes, circulates and reabsorbs CSF. […] Theres also evidence that NPH might have a connection to degenerative brain conditions like Alzheimers disease, Lewy body dementia or similar conditions. Researchers are continuing to explore exactly how and why NPH happens and whether or not other conditions can contribute to it.

• #2 Hydrocephalus in Adults: Causes, Diagnosis, Surgery and More | Mya Care

  https://myacare.com/procedure/adult-hydrocephalus

  Hydrocephalus occurs when too much cerebrospinal fluid (CSF) accumulates in the ventricles (cavities) of the brain, which can increase the pressure inside the head. […] The type of hydrocephalus that appears at any point after birth is known as acquired hydrocephalus. Acquired hydrocephalus can be diagnosed in both adults and children. The most frequent causes include the following: Brain tumors, Head injuries, Meningitis or other infection of the brain or spinal cord, Brain bleed (Intraventricular hemorrhage). […] Congenital hydrocephalus is caused by a complex combination of environmental and genetic variables during fetal development. The following are the most common causes of congenital hydrocephalus: Spina bifida, Brain malformations, Aqueductal stenosis. […] Normal pressure hydrocephalus (NPH) occurs when fluid accumulation in or around the brain impairs brain function. It may affect various mental functions, including memory, thinking and concentration, movement, etc. NPH can sometimes be reversed, even though its symptoms closely resemble those of dementia. […] Idiopathic NPH (iNPH) is the term used to describe cases of NPH in which the reason for the obstruction in the CSF absorptive pathways is not known. The term „secondary NPH” refers to situations where a cause is obvious (e.g., trauma, stroke, tumor, or meningitis).

• #2 Hydrocephalus: Causes, Symptoms, and Treatment

  https://www.webmd.com/brain/normal-pressure-hydrocephalus

  Normal pressure hydrocephalus (NPH) is a type of hydrocephalus that usually happens in older adults. […] Hydrocephalus has many different causes. Some people are born with the condition, while others develop it during their lives. […] In most cases, the cause of NPH isn’t known, but several things can lead to it, including: A head injury, Bleeding around the brain (due to a blow to the head), A stroke, Meningitis (infection of a protective layer of tissue around the brain), Brain tumor, Surgery on the brain. […] How these conditions lead to NPH is not clear. […] Normal pressure hydrocephalus is not caused by any structural abnormality. In most cases, the underlying problem is not known or cannot be treated. […] The earlier the NPH is diagnosed, the better the chances that the surgery will help. […] It’s important to know that no drug or other medical treatment is known to work in NPH. […] There is no known way to prevent NPH.

• #2 Causes and Diagnoses of Normal Pressure Hydrocephalus | Northwestern Medicine

  https://www.nm.org/conditions-and-care-areas/neurosciences/normal-pressure-hydrocephalus/causes-and-diagnoses

  Normal pressure hydrocephalus (NPH) occurs if the normal flow of cerebrospinal fluid (CSF) throughout the brain and spinal cord is blocked. The blockage may be caused by: A past injury […] Bleeding […] Infection […] Brain tumor […] Surgery on the brain. Often, the blockages cause is not known.

• #2

  https://www.nhs.uk/conditions/hydrocephalus/causes/

  In many cases of congenital hydrocephalus the cause is unknown. […] Hydrocephalus that develops in children and adults (acquired hydrocephalus) is usually the result of an injury or illness. […] Possible causes of acquired hydrocephalus include: bleeding inside the brain for example, if blood leaks over the surface of the brain (subarachnoid haemorrhage), blood clots in the brain (venous thrombosis), meningitis an infection of the membranes surrounding the brain and spinal cord, brain tumours, head injury, stroke. […] Older people can sometimes develop normal pressure hydrocephalus (NPH) after a brain injury, bleeding in the brain or an infection. But it’s often not clear why NPH happens. […] It may be that NPH is linked to other underlying health conditions that affect the normal flow of blood for example, diabetes, heart disease, or having a high level of cholesterol in the blood.

• #2 Hydrocephalus: Practice Essentials, Background, Pathophysiology

  https://emedicine.medscape.com/article/1135286-overview

  Hydrocephalus, also known as a hydrodynamic CSF disorder, is broadly defined as a disturbance of cerebrospinal fluid (CSF) formation, flow, or absorption, leading to an increase in volume occupied by this fluid in the central nervous system (CNS). […] Clinical features of hydrocephalus are influenced by the patient’s age, the cause of the hydrocephalus, the location of the obstruction, its duration, and its rapidity of onset. […] Acute hydrocephalus occurs over days, subacute hydrocephalus occurs over weeks, and chronic hydrocephalus occurs over months or years. Conditions such as cerebral atrophy and focal destructive lesions also lead to an abnormal increase of CSF in CNS. In these situations, loss of cerebral tissue leaves a vacant space that is filled passively with CSF. Such conditions are not the result of a hydrodynamic disorder and therefore are not classified as hydrocephalus.

• #2 Hydrocephalus – Symptoms, Causes, Treatments

  https://resources.healthgrades.com/right-care/brain-and-nerves/hydrocephalus

  Hydrocephalus results from an imbalance between the formation of cerebrospinal fluid and its absorption. The cause of this is not always known. […] In some cases, hydrocephalus can occur with other birth defects such as spina bifida (incomplete closure of the spinal cord) or it may be related to genetic abnormalities, infection, or trauma. Premature babies who have cerebral hemorrhage (bleeding in the brain) may develop hydrocephalus. Sometimes it can occur as a result of a tumor that blocks the flow of cerebrospinal fluid. […] A number of factors increase the risk of developing hydrocephalus. Not all people with risk factors will get hydrocephalus. Risk factors for hydrocephalus include: Abnormalities of brain development and formation, Brain or spinal cord injury, Brain or spinal cord tumors, Family history, Inadequate maternal folic acid consumption (neural tube defects occur in fetus), Meningitis (infection or inflammation of the sac around the brain and spinal cord) or other brain infection, Prenatal infection, Preterm birth, Spina bifida (incomplete closure of the spinal cord).

• #2 Hydrocephalus | Radiology Reference Article | Radiopaedia.org

  https://radiopaedia.org/articles/hydrocephalus?lang=us

  Hydrocephalus denotes an increase in the volume of CSF, causing the distension of cerebral ventricles (ventriculomegaly) due to insufficient passage of the CSF from its point of production in the ventricles into the systemic circulation, whether that be via resorption into the dural venous sinuses or via the glymphatic pathway 7. […] Types of hydrocephalus are as follows (see figures 1 and 2): […] non-communicating (i.e. CSF cannot exit the ventricular system, and thus there is by definition obstruction to CSF absorption) […] numerous causes including 8: […] although it is widely believed that defective absorption of CSF at the arachnoid granulation is the cause of communicating hydrocephalus; however, obstruction between spinal subarachnoid space and basal cisterns or between the basal cisterns and arachnoid villi are more common.

• #2 Hydrocephalus: Practice Essentials, Background, Pathophysiology

  https://emedicine.medscape.com/article/1135286-overview

  Communicating hydrocephalus occurs when full communication occurs between the ventricles and subarachnoid space. It is caused by overproduction of CSF (rarely), defective absorption of CSF (most often, includes conditions such as intracranial hemorrhage or meningitis resulting in damage to the arachnoid granulations, where CSF is reabsorbed), or venous drainage insufficiency (occasionally). […] Noncommunicating hydrocephalus occurs when CSF flow is obstructed within the ventricular system or in its outlets to the arachnoid space, resulting in impairment of the CSF from the ventricular to the subarachnoid space. The most common form of noncommunicating hydrocephalus is obstructive and is caused by intraventricular or extraventricular mass-occupying lesions that disrupt the ventricular anatomy.

• #2 Loss of Rsph9 causes neonatal hydrocephalus with abnormal development of motile cilia in mice | Scientific Reports

  https://www.nature.com/articles/s41598-020-69447-4

  Hydrocephalus was caused by postnatal developmental defects. […] Therefore, these results indicate that the barrier of CSF flow is due to the disrupted activity of the ependymal cells. […] The defects in Rsph9/ cilia may due to disorders of sliding motion between adjacent microtubules. […] These results show that RSPH9 is necessary for coordinated beating of ependymal cilia. Defects in Rsph9/ ependymal cells can lead to disruption of the pattern of cilia beating and can give rise to hydrocephalus. […] Hydrocephalus can damage brain tissue and cause a wide range of symptoms. […] Altogether, these results suggest that in P8 Rsph9/ mice, hydrocephalus is associated with severe pathological reactions, inflammation reactions and myelination disorders.

• #2 Hydrocephalus Causes & Symptoms | Hydrocephalus Lawyer & Attorneys

  https://www.abclawcenters.com/practice-areas/hydrocephalus/

  Sometimes, babies with birth injuries develop a condition called hydrocephalus, which is characterized by excessive fluid in the brain. […] Hydrocephalus in newborns may be congenital or acquired. Congenital hydrocephalus can be caused by genetic abnormalities or complications during fetal development. Acquired hydrocephalus is caused by something that goes wrong during the birthing process or shortly after. Examples include: Birth trauma: If a baby is harmed due to excessive mechanical force during labor and delivery, this is called birth trauma or a traumatic birth injury. […] Because intracranial hemorrhages underlie many cases of acquired hydrocephalus, it is important to know the causes and risk factors for brain bleeds. These include the following: Prematurity: Premature babies often have a low birth weight and underdeveloped blood vessels, which can easily rupture due to injury. […] Hydrocephalus can also cause permanent brain damage and impact both cognitive and physical development when not timely diagnosed and treated.

• #2 Normal Pressure Hydrocephalus in Adult Mice Causes Gait Impairment, Cognitive Deficits, and Urinary Frequency with Incontinence | eNeuro

  https://www.eneuro.org/content/11/11/ENEURO.0412-24.2024

  Hydrocephalus developed gradually after kaolin injection, primarily in the first few weeks and more slowly thereafter. […] A defining feature of NPH is the lack of elevated intracranial pressure (ICP). […] The initial inflammatory response to kaolin may lead to a CSF-resorptive deficit that causes hydrocephalus. […] This type of inflammatory response could be responsible for CSF-resorptive deficits in a subset of communicating hydrocephalus cases. […] The symptoms are not explained simply by the degree of ventriculomegaly, and additional work is needed to identify the neural circuit mechanism of each symptom.

• #3 Hydrocephalus: Symptoms, Causes, Types, Diagnosis, Treatment

  https://www.webmd.com/brain/hydrocephalus-facts

  Hydrocephalus happens most often in infants or in adults older than 60, but you can have it at any age. […] The three main causes of hydrocephalus are: […] A blockage. Tumors, cysts, birth defects, brain injury, or stroke can block or affect the normal flow of cerebrospinal fluid. […] Poor fluid absorption. Inflammation, injuries, or infections like bacterial meningitis can keep your brain tissues from taking in cerebrospinal fluid. […] Too much fluid. In rare cases, your body makes more cerebrospinal fluid than your brain can handle, often due to infection like meningitis.

• #3 Hydrocephalus Symptoms, Causes and Surgical Treatments | MNC

  https://miamineurosciencecenter.com/en/conditions/hydrocephalus/

  Hydrocephalus can affect anyone, although it is more common in infants and adults over the age of 60. One out of every 1,000 infants is born with this condition. The cause of hydrocephalus varies depending on the type. […] Aqueductal stenosis: This is the most common cause of congenital hydrocephalus. It involves the narrowing or blockage of an area of the brain known as the Cerebral Aqueduct (Aqueduct of Sylvius) a narrow tube between the third and fourth ventricles in the brain. It may become blocked due to certain types of bacterial, viral or parasitic infections, tumors, chiari malformation, or abnormal brain development. […] Neural tube defect: In a developing embryo, the neural tube is the structure that, in a healthy child, forms the brain and spinal cord. In cases of neural tube defect (NTD), the neural tube fails to close properly, leaving the spinal cord exposed. In some cases, this can cause leakage of CSF.

• #3 What causes hydrocephalus? | Hydrocephalus and Young People | SBH Scotland

  https://www.hydrocephalusscotland.org.uk/content/what-causes-hydrocephalus/

  Most babies born with spina bifida also have Hydrocephalus. This is because, as well as problems with the spinal cord, certain parts of the brain do not develop the way they should before birth. This prevents proper drainage of the CSF which causes a collection of fluid and increased pressure in the brain. This can compress the abnormal parts of the brain (the bits affected by spina bifida) even further. […] Babies born prematurely are at risk of developing Hydrocephalus. When a baby is born early, its brain is still developing at the time of birth. This makes it far more vulnerable than the brain of a baby that goes to full term. […] Other forms of brain haemorrhage, including those occurring in adults (’stroke’) can cause blockages to the flow of CSF. This might result in post-haemorrhagic Hydrocephalus.

• #3 Hydrocephalus: Practice Essentials, Background, Pathophysiology

  https://emedicine.medscape.com/article/1135286-overview

  Congenital hydrocephalus applies to the ventriculomegaly that develops in the fetal and infancy periods, often associated with macrocephaly. The most common causes of congenital hydrocephalus are obstruction of the cerebral aqueduct flow, Arnold-Chiari malformation or Dandy-Walker malformation. […] Normal pressure hydrocephalus (NPH) is a rare condition characterized by abnormal gait, urinary incontinence, and (potentially reversible) dementia. It can occur in persons of any age but is most common in older adults.

• #3

  https://www.nhs.uk/conditions/hydrocephalus/

  Hydrocephalus can be caused by a condition such as spina bifida, or an infection the mother develops during pregnancy, such as mumps or rubella (German measles). […] Acquired hydrocephalus can affect children or adults. It usually develops after an illness or injury. […] Normal pressure hydrocephalus (NPH) can sometimes develop after an injury or a stroke, but in most cases the cause is unknown. […] If this process is interrupted, the amount of CSF can quickly build up, cause pressure in the brain.

• #3 Hydrocephalus Symptoms, Causes and Surgical Treatments | MNC

  https://miamineurosciencecenter.com/en/conditions/hydrocephalus/

  Bleeding within the brain: In premature newborns, small blood vessels in the brains ventricles can hemorrhage, causing blockages or scar tissue. This can cause a build-up of CSF. […] Meningitis: This is an infection that damages the membranes protecting the brain and spinal cord, usually by a bacterial infection. […] Injury to the head: Trauma to the head can cause damage to tissues and blood vessels, which can lead to a build-up of CSF. […] Certain types of brain tumor: In infants, if brain tumors occur, they typically develop in the back of the brain. This type of tumor may cause hydrocephalus by blocking the brains fourth ventricle. […] In many cases of normal-pressure hydrocephalus, the cause is not known (idiopathic). In other cases, it may be due to brain injury, certain types of tumors, inflammation, or an infection. […] Hydrocephalus ex vacuo is caused when the brain has been damaged due to trauma or stroke.

• #3 What Causes Hydrocephalus – Functions | Treatment

  https://www.icliniq.com/articles/neurological-health/what-causes-hydrocephalus

  Alternatively, there may be no obstruction but instead the arachnoid villi may be dysfunctional and not allowing reabsorption which is called communicating hydrocephalus. Communicating hydrocephalus may have no discernible cause or may happen following hemorrhages, infections, or trauma to the brain. […] The possible causes of hydrocephalus are: – A blood clot in the brain. – Infection in the brain and the spinal cord. – Internal bleeding. – Genetics. […] Bacterial meningitis is the most common cause of the occurrence of hydrocephalus in infants. The other common cause of hydrocephalus is bleeding in the brain. The least common cause is genetic issues.

• #3 What causes hydrocephalus? | Hydrocephalus and Young People | SBH Scotland

  https://www.hydrocephalusscotland.org.uk/content/what-causes-hydrocephalus/

  This is an infection of the membranes covering the brain. The inflammation and debris from this infection may block the drainage pathways of CSF and could result in Hydrocephalus. […] In these cases, Hydrocephalus is often due to pressure on the surrounding tissues by the enlarging cyst. […] Tumours of the brain cause compression and swelling of surrounding tissues resulting in poor drainage of CSF. […] In very rare circumstances, Hydrocephalus is due to hereditary factors which might affect future generations. There are many other very rare causes of hydrocephalus, and sometimes it is unknown why it has happened. […] Cerebral palsy is not a cause of hydrocephalus but may occur alongside it. Cerebral palsy can also be associated with brain trauma before or after birth from a haemorrhage or meningitis, for example. Co-occurrence of hydrocephalus and cerebral palsy can increase the type and severity of difficulties experienced.

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