Hydrocephalus

When a newborn or infant is diagnosed with hydrocephalus, parents often face a wave of medical information, unfamiliar terminology, and understandable worry about what lies ahead. Understanding what hydrocephalus is, how it develops, and what treatment options exist can help families navigate this challenging diagnosis with greater clarity and confidence.

Hydrocephalus is one of the most common reasons for pediatric neurosurgery in the United States, affecting over one million people nationwide. While it is a serious condition that requires prompt medical attention, early diagnosis and appropriate intervention can significantly improve long-term outcomes. This page is designed to provide families with medically accurate, compassionate information about hydrocephalus, particularly as it relates to newborns and infants who may have developed the condition during pregnancy or shortly after birth.

What Is Hydrocephalus

Hydrocephalus is a neurological condition marked by the abnormal buildup of cerebrospinal fluid within the brain’s internal cavities, known as ventricles. Cerebrospinal fluid, or CSF, is a clear, protective fluid that normally circulates around the brain and spinal cord, cushioning these delicate structures and helping remove waste products. In a healthy system, CSF is continuously produced, circulated, and absorbed in a balanced cycle.

When this balance is disrupted, either because too much fluid is produced, the pathways become blocked, or the body cannot absorb the fluid properly, CSF accumulates in the ventricles. This buildup increases pressure inside the skull and can compress or damage surrounding brain tissue. The degree of damage depends on how quickly the fluid builds up, how much pressure develops, and how soon treatment begins.

Hydrocephalus can be present at birth, known as congenital hydrocephalus, or it can develop later due to injury, infection, or other medical complications, referred to as acquired hydrocephalus.

Causes of Hydrocephalus in Infants and Newborns

The reasons hydrocephalus develops in babies can vary widely. Understanding the underlying cause is an important part of diagnosis and treatment planning.

Congenital Hydrocephalus

Congenital hydrocephalus is present at birth and often results from developmental abnormalities that occur during pregnancy. These include structural issues with the brain or problems with how CSF pathways form. Some of the more common causes include:

Aqueductal stenosis occurs when the narrow passageway between brain ventricles, called the cerebral aqueduct, becomes narrowed or blocked. This prevents normal CSF flow and leads to fluid buildup in the ventricles above the blockage.

Dandy-Walker malformation is a condition where the fourth ventricle, one of the brain’s fluid-filled spaces, becomes enlarged and certain parts of the cerebellum do not develop normally. This structural difference can interfere with CSF circulation.

Chiari malformations, particularly Type II (Arnold-Chiari malformation), involve the lower part of the brain extending into the spinal canal. This can block the flow of CSF and is often associated with spina bifida.

Genetic syndromes and chromosomal abnormalities may also include hydrocephalus as one of several features.

In many cases of congenital hydrocephalus, fetal ultrasound during the second or third trimester can detect enlarged ventricles, though the full extent of the condition may not be apparent until after birth.

Acquired Hydrocephalus

Acquired hydrocephalus develops after birth and is frequently seen in premature or medically fragile infants. Common causes include:

Intraventricular hemorrhage is bleeding inside or around the brain’s ventricles, most commonly seen in premature babies. Premature infants have fragile blood vessels that can rupture, especially in the first few days of life. When blood enters the ventricular system, it can block the normal pathways for CSF drainage or interfere with absorption, leading to post-hemorrhagic hydrocephalus. This is one of the leading causes of hydrocephalus in newborns.

Infections such as bacterial meningitis or other infections affecting the brain and spinal cord can cause inflammation, scarring, or blockages that disrupt normal CSF flow.

Tumors or masses in the brain, though less common in newborns, can obstruct CSF pathways.

Traumatic brain injury during or shortly after birth may also result in hydrocephalus, though this is relatively uncommon.

Babies born prematurely, at low birth weight, or who have experienced complications during delivery are at higher risk for developing hydrocephalus, particularly the post-hemorrhagic form.

Recognizing the Signs and Symptoms

The symptoms of hydrocephalus vary depending on the age of the child, how quickly the fluid buildup occurs, and how much pressure develops inside the skull. Parents and caregivers should be aware of the warning signs, especially in the weeks and months following birth.

Symptoms in Infants

Because the skull bones of newborns and young infants have not yet fused, the head can expand to accommodate increased pressure. This makes certain physical signs more noticeable:

• A rapidly growing head circumference is often the first sign. Doctors routinely measure head size at well-baby visits, and growth that exceeds normal percentiles can signal a problem.
• A bulging or tense soft spot (fontanelle) on the top of the baby’s head, even when the baby is upright and calm, may indicate increased pressure.
• Sunsetting eyes, where the baby’s eyes appear to gaze downward and the whites of the eyes are visible above the iris, can be a sign of pressure on parts of the brain that control eye movement.
• Vomiting, poor feeding, excessive sleepiness, or extreme irritability are common and can be mistaken for other infant illnesses, making medical evaluation important.
• Developmental delays may become apparent over time if pressure affects brain function.
• Seizures can occur in more severe cases.

Symptoms in Older Children and Adults

In children whose skull bones have fused and in adults, the head cannot expand to relieve pressure. Symptoms in these groups often include:

• Persistent headaches, particularly in the morning or that worsen when lying down
• Nausea and vomiting
• Problems with balance and coordination
• Blurred or double vision
• Cognitive changes, including difficulty concentrating, memory problems, or changes in school performance
• Personality or behavior changes
• Urinary incontinence or difficulty with bladder control

In older adults, a type of hydrocephalus called normal pressure hydrocephalus can develop, often presenting with walking difficulties, memory problems resembling dementia, and loss of bladder control. This form is sometimes misdiagnosed as Alzheimer’s disease or Parkinson’s disease.

How Hydrocephalus Is Diagnosed

Diagnosing hydrocephalus involves clinical evaluation and imaging studies that allow doctors to visualize the brain’s ventricles and assess the degree of fluid buildup.

Prenatal Diagnosis

Routine prenatal ultrasounds, typically performed between 15 and 35 weeks of pregnancy, can sometimes detect enlarged ventricles in the developing fetus. If hydrocephalus is suspected, additional imaging or follow-up ultrasounds may be recommended to monitor progression. While prenatal intervention is not currently standard practice, early detection allows families and medical teams to prepare for the care the baby will need after birth.

Postnatal Diagnosis

After birth, several imaging techniques can confirm hydrocephalus:

Ultrasound is often the first imaging tool used in newborns, particularly premature infants. It is safe, non-invasive, and can be performed at the bedside. Ultrasound can visualize the ventricles through the fontanelle before the skull bones close.

Magnetic resonance imaging (MRI) provides detailed images of brain structures and is useful for identifying the cause of hydrocephalus, such as malformations, tumors, or blockages.

Computed tomography (CT) scans offer quick imaging and are sometimes used in emergency settings or when MRI is not available, though they involve exposure to radiation.

Doctors also assess the baby’s head circumference over time, neurological function, and developmental milestones as part of the diagnostic process.

Treatment Options

Treatment for hydrocephalus almost always involves surgery to relieve the pressure caused by excess cerebrospinal fluid. The specific approach depends on the underlying cause, the baby’s age and overall health, and the preferences of the medical team and family.

Shunt Placement

The most common and longstanding treatment for hydrocephalus is the surgical placement of a shunt system. A shunt is a flexible tube that is inserted into one of the brain’s ventricles to drain excess CSF and redirect it to another part of the body where it can be absorbed. Most often, the fluid is drained into the abdominal cavity, a procedure known as a ventriculoperitoneal (VP) shunt. In some cases, the fluid may be diverted to the heart or chest cavity.

The shunt system includes a valve that regulates the amount and flow rate of CSF being drained, preventing too much or too little fluid from leaving the brain. While shunt surgery is generally safe and effective, it does carry risks, including infection, blockage, or mechanical failure. Because infants and children grow, shunts may need to be revised or replaced over time. Lifelong monitoring is typically required.

Endoscopic Third Ventriculostomy

An alternative to shunt placement in certain cases is a procedure called endoscopic third ventriculostomy (ETV). During this minimally invasive surgery, a neurosurgeon creates a small opening in the floor of the third ventricle, allowing CSF to bypass the blockage and flow normally. ETV is most effective in cases where hydrocephalus is caused by an obstruction rather than problems with CSF absorption. It may not be suitable for all infants, particularly very young babies or those with post-hemorrhagic hydrocephalus.

ETV has the advantage of not requiring a permanent implant, but it does not work for everyone, and some patients may still need a shunt if the procedure does not provide lasting relief.

Management of Post-Hemorrhagic Hydrocephalus

Babies who develop hydrocephalus following intraventricular hemorrhage often require specialized, staged treatment. Initial management may involve temporary measures such as:

Ventricular taps, where a needle is used to remove small amounts of CSF to relieve pressure

Ventricular reservoirs or subgaleal shunts, which are temporary devices that allow gradual drainage while the baby stabilizes

Once the baby is medically stable and the bleeding has resolved, a permanent shunt is typically placed. Because post-hemorrhagic hydrocephalus can be complex, care is often coordinated through regional pediatric neurosurgical centers with experience in managing premature and medically fragile infants.

Ongoing and Multidisciplinary Care

Treatment does not end with surgery. Infants and children with hydrocephalus benefit from ongoing, coordinated care involving multiple specialists. This may include:

• Pediatric neurologists and neurosurgeons who monitor shunt function and brain development
• Developmental pediatricians who assess milestones and provide early intervention referrals
• Physical, occupational, and speech therapists who support motor and communication skills
• Social workers and care coordinators who help families access services and navigate the healthcare system
• Regular follow-up visits, imaging studies, and developmental assessments are essential to ensuring the best possible outcomes.

Prognosis and Long-Term Outlook

The long-term outlook for children with hydrocephalus varies widely and depends on several factors, including the cause of the condition, the age at diagnosis, how quickly treatment is provided, and whether other health issues or developmental challenges are present.

With early and appropriate treatment, many children with hydrocephalus go on to lead healthy, fulfilling lives. Some experience no significant developmental delays, while others may face challenges with learning, motor skills, or behavior that require additional support.

Shunt complications are relatively common and can include infection, blockage, or malfunction. Families should be educated on the warning signs of shunt failure, such as headache, vomiting, irritability, changes in alertness, or regression in developmental skills. Prompt medical attention is critical if these symptoms occur.

Children treated at experienced pediatric centers, including major hospitals throughout New York such as Mount Sinai, NYU Langone, Columbia Presbyterian, and Albany Medical Center, have access to advanced surgical techniques, cutting-edge diagnostic tools, and multidisciplinary support teams that can make a meaningful difference in outcomes.

Research and Advances in Care

Hydrocephalus remains an area of active medical research. Scientists and clinicians are working to better understand the underlying mechanisms of CSF production and absorption, improve shunt technology to reduce complications, and develop new treatment approaches.

Clinical trials are underway exploring less invasive surgical techniques, better shunt materials, and ways to predict which patients are most likely to benefit from procedures like ETV. Advances in imaging and genetic testing are also helping doctors diagnose hydrocephalus earlier and more accurately.

Organizations such as the Hydrocephalus Association support research, provide patient education, and advocate for improved care standards. Staying informed about new developments can help families make the best decisions for their child’s care.

Support and Resources for Families

Receiving a diagnosis of hydrocephalus can feel overwhelming. It is normal to experience fear, confusion, and sadness. Connecting with other families who have navigated similar challenges, accessing clear and trustworthy information, and building a strong care team can all help ease the journey.

Many hospitals offer family education programs, peer support groups, and access to social services for families affected by hydrocephalus. National organizations provide online resources, educational materials, and opportunities to connect with others.

Early intervention services, available through state programs, can provide developmental therapies at no cost to families of infants and toddlers with developmental delays or disabilities. These services are designed to support the child’s growth and help families feel empowered in their caregiving role.

At NYBirthInjury.com, we are committed to providing families with accurate, compassionate information about birth injuries and related conditions. We understand that knowledge is a powerful tool, and we aim to help families feel more confident as they make decisions about their child’s care and seek the support they need. Whether you are looking for medical explanations, trying to understand your options, or hoping to connect with others who understand what you are going through, trusted resources are available to guide you.

Moving Forward with Care and Confidence

Hydrocephalus is a serious condition, but it is also one that medical teams across the country treat successfully every day. With timely diagnosis, skilled surgical intervention, and ongoing support, children with hydrocephalus can thrive. Each child’s journey is unique, and outcomes depend on many factors, but early action and informed advocacy make a meaningful difference.

If you have concerns about your child’s development, head growth, or symptoms that may be related to hydrocephalus, trust your instincts and reach out to your pediatrician or a pediatric neurologist. Medical professionals are there to listen, evaluate, and guide you toward the care your child needs.

You are not alone in this. Families, medical teams, and support networks are here to walk alongside you. And if you believe your child’s condition was caused by medical malpractice, don’t hesitate to seek legal guidance. Contact us today for free consultation, and learn about your options and rights.