Pediatric Hydrocephalus Surgery

Introduction

If your child has been diagnosed with hydrocephalus and surgery has been recommended, you are likely facing a difficult mix of feelings — worry about the brain, questions about long-term development, and a need to understand exactly what the next steps look like. This guide is written for parents and families in that position.

Hydrocephalus is a condition in which extra cerebrospinal fluid (CSF) collects inside the spaces of the brain called ventricles. Without treatment, the rising pressure can affect how the brain grows and works. Surgery is the main treatment, and it has been performed and refined for decades. Most children who have surgery for hydrocephalus go on to grow, learn, and take part in family and school life, though the journey often includes long-term follow-up and, in some cases, more than one operation.

The pages that follow explain what pediatric hydrocephalus surgery is, the two main types of procedures, how children are prepared, what happens in the hospital, what recovery looks like at home, the risks involved, and how families live with a shunt or an endoscopic procedure over the long term. The aim is to help you ask informed questions of your child’s neurosurgical team and to know what to expect at each stage.

What Is Pediatric Hydrocephalus Surgery?

Pediatric hydrocephalus surgery is a neurosurgical treatment that relieves the buildup of cerebrospinal fluid (CSF) inside a child’s brain. CSF is a clear fluid that normally cushions the brain and spinal cord, delivers nutrients, and carries away waste. The body continuously makes CSF, circulates it through the ventricles, and absorbs it back into the bloodstream.

In hydrocephalus, this cycle is disrupted. Either the fluid cannot drain properly because of a blockage (called obstructive or non-communicating hydrocephalus), or the fluid is not absorbed back into the bloodstream as it should be (called communicating hydrocephalus). In both cases, the ventricles enlarge and pressure inside the skull rises. In infants, whose skull bones have not yet fused, the head itself may grow faster than expected. In older children, the rising pressure causes headaches, vomiting, vision changes, and other symptoms.

Surgery does not cure the underlying problem with the CSF pathway. Instead, it creates a new way for the fluid to drain or bypass the blockage, which protects the brain from injury and allows development to continue. There are two main types of operation:

• Ventriculoperitoneal (VP) shunt placement — a thin tube system that drains CSF from the brain to the abdomen, where the body absorbs it.
• Endoscopic third ventriculostomy (ETV) — a minimally invasive procedure that creates a small opening inside the brain to let trapped CSF flow around the blockage.

Which procedure suits a child depends on the cause of the hydrocephalus, the child’s age, the shape of the ventricles on imaging, and the surgeon’s assessment. Both procedures are well established and are performed worldwide by pediatric neurosurgical teams.

Why Pediatric Hydrocephalus Surgery Is Performed

Hydrocephalus has many causes. In children, neurosurgeons typically recommend surgery once imaging and clinical assessment show that CSF is building up under pressure and that the child’s brain is at risk. Common situations include:

• Congenital hydrocephalus — present at birth, sometimes detected on prenatal ultrasound. Causes include aqueductal stenosis (a narrowing of one of the CSF channels), spina bifida with associated Chiari malformation, and other developmental conditions.
• Post-haemorrhagic hydrocephalus of prematurity — bleeding in the brain in premature babies can block CSF drainage and is one of the most common causes in newborns.
• Post-infectious hydrocephalus — meningitis and certain other infections can scar the CSF pathways. This is a particularly important cause in many parts of the world.
• Tumour-related hydrocephalus — a brain tumour pressing on the CSF channels can cause obstruction.
• Post-traumatic hydrocephalus — head injury, with or without bleeding, can disrupt CSF flow.
• Dandy-Walker malformation and other structural causes — developmental differences in the back of the brain can lead to fluid build-up.

The reason for performing surgery is the same across these causes: to prevent or limit the brain injury that uncontrolled pressure would otherwise cause. The earlier surgery is carried out once the diagnosis is clear, the better the chance of protecting brain development.

Symptoms that often lead to surgery

By the time you are reading this, the diagnostic work has often already been done. The signs that brought your child to neurosurgical attention may have included:

• A rapid increase in head circumference in a baby
• A bulging or tense soft spot (fontanelle)
• Prominent veins on the scalp
• Eyes that appear to look downward (the “sunset sign”)
• Vomiting, particularly in the mornings or unrelated to feeding
• Irritability, sleepiness, or poor feeding in infants
• Headaches, blurred or double vision, balance problems, or new learning difficulties in older children
• Imaging (ultrasound, MRI, or CT) showing enlarged ventricles

If your child has not yet had surgery scheduled and you notice any of these signs becoming rapidly worse, contact your neurosurgical team without delay.

Who Is a Candidate for Surgery?

Not every child with enlarged ventricles needs immediate surgery. Some children have what is called arrested or compensated hydrocephalus, in which the fluid build-up has stabilised and the brain has adjusted. In those situations, doctors may watch and re-image rather than operate. Surgery is generally considered when imaging shows that fluid is building up under pressure and one or more of the following is present:

• Symptoms of raised intracranial pressure
• Progressive increase in head size in an infant
• Worsening developmental milestones, vision, or alertness
• An obvious obstruction on imaging that is unlikely to resolve on its own

The decision between VP shunt and ETV is a clinical one that depends on the type and cause of hydrocephalus. In general:

• ETV is most often considered in children with obstructive hydrocephalus, particularly aqueductal stenosis, and is more successful in older infants and children than in very young babies. In some children, ETV is combined with a procedure called choroid plexus cauterisation (ETV-CPC) to reduce CSF production; this combined approach is used in selected cases, especially in younger infants.
• VP shunt is generally used when ETV is unlikely to succeed — for example, in communicating hydrocephalus, in very young infants with post-haemorrhagic hydrocephalus, or when previous ETV has failed.

Your child’s neurosurgeon will weigh these factors and discuss the recommendation with you before any operation.

Surgical Approaches

Two main approaches are used worldwide for treating pediatric hydrocephalus. Both are performed under general anaesthesia in an operating theatre by a pediatric neurosurgical team. The approach chosen depends on the cause of the hydrocephalus, the child’s age, and the anatomy seen on imaging.

Ventriculoperitoneal (VP) shunt placement

A shunt is a thin, soft silicone tube system that drains CSF from a ventricle in the brain to another part of the body where it can be absorbed. The most common type drains into the peritoneal cavity in the abdomen, which is why it is called ventriculoperitoneal (VP).

A typical VP shunt has three parts:

• A ventricular catheter, placed through a small hole in the skull into one of the brain’s ventricles
• A valve, often located just beneath the scalp behind the ear, which regulates the flow and pressure of CSF
• A distal catheter, tunnelled under the skin from the head, down the neck and chest, to the abdomen

Once placed, the shunt drains excess fluid continuously and quietly, with no action needed by the child. Some shunt valves are programmable, meaning their pressure setting can be adjusted from outside the body using a special magnetic device. Programmable valves are useful because the right setting can be fine-tuned over time without further surgery, but they can be affected by strong magnetic fields, so families need to be aware of MRI scans and certain magnetic toys.

Less commonly, the distal end of the shunt is placed somewhere other than the abdomen — for example, the right atrium of the heart (ventriculoatrial shunt) or the space around the lungs (ventriculopleural shunt). These alternatives are reserved for children in whom the abdominal route is not suitable.

The strength of a VP shunt is that it works in almost any type of hydrocephalus. The trade-off is that it is a permanent implant that can block, become infected, or need revision as a child grows. Many children with shunts will need at least one revision during childhood.

Endoscopic third ventriculostomy (ETV)

ETV is a minimally invasive operation that does not leave any tube or device inside the body. Instead, the neurosurgeon uses a thin telescope-like instrument called an endoscope to create a small opening in the floor of the third ventricle. This opening allows CSF that has been trapped behind a blockage to flow into the natural spaces around the brain, where it can be reabsorbed.

Steps generally include:

1. A small hole, about the size of a coin or less, is made in the skull.
2. The endoscope is passed through this hole into a lateral ventricle.
3. The surgeon guides the endoscope into the third ventricle.
4. A tiny opening is created in the floor of the third ventricle.
5. In some cases, the choroid plexus — the tissue that makes CSF — is also cauterised (ETV-CPC) to reduce fluid production, especially in young infants.

The main advantage of ETV is that it avoids implanted hardware, and therefore avoids the risk of shunt blockage, shunt infection, and shunt revisions over a child’s lifetime. The trade-off is that ETV does not work for every type of hydrocephalus, and the opening can close again, particularly in the first six months. Children who have had ETV need careful follow-up to detect any return of symptoms.

Long-term studies suggest that when ETV is successful in the first six to twelve months, it often continues to work for years. When it fails, families and surgeons usually move to a VP shunt.

Anaesthesia and hospital stay

Both procedures are performed under general anaesthesia. A pediatric anaesthetist will assess your child beforehand and stay with them throughout the operation.

• Operating time: Most VP shunt insertions take between 45 minutes and 2 hours. ETV is often of similar length.
• Recovery room: Children wake up in a recovery area before being moved to a ward or a pediatric intensive care unit, depending on their age and condition.
• Hospital stay: A typical stay is between two and seven days, often longer for very young infants or for children who had hydrocephalus from prematurity or infection.

Alternatives and Watchful Waiting

Surgery is the main treatment for hydrocephalus that is causing pressure or symptoms. There is no medication that reliably cures hydrocephalus, although medicines such as acetazolamide are sometimes used for short periods in very specific situations, for example to slow CSF production temporarily in premature babies while the team decides on the timing of surgery. These medicines are not a substitute for surgery when the brain is under pressure.

In some children, particularly those with mild ventricle enlargement and no symptoms, doctors may recommend a period of careful observation with repeat imaging and developmental checks rather than immediate surgery. This is a clinical judgement based on the specific case.

For children who do need surgery, the meaningful choice is between the two main approaches — VP shunt and ETV (sometimes with choroid plexus cauterisation) — rather than between surgery and no surgery. Your child’s neurosurgeon will explain which approach is being recommended and why.

Preparing for Surgery

Preparation usually takes place in the days before the operation, although for very urgent cases it can happen within hours.

Tests your child may have

• MRI scan — the most detailed view of the ventricles and the CSF pathways, and the key test for deciding between VP shunt and ETV
• CT scan — faster than MRI and often used in urgent situations
• Cranial ultrasound — used in infants whose fontanelle is still open
• Blood tests — to check overall health and clotting
• Anaesthetic assessment — the anaesthetist will review your child’s breathing, heart, and any other health conditions
• Developmental assessment — a baseline of motor skills, language, and other milestones can be helpful for comparison after surgery

What to do in the days before

• Tell the team about all of your child’s medicines, including herbal or over-the-counter products.
• Let the team know about any recent fevers, coughs, colds, or skin infections. Active infection may need to be treated before surgery.
• Follow the fasting instructions exactly. These usually mean no solid food for several hours before surgery, with clear fluids allowed up to a defined time. The exact times depend on your child’s age and the hospital’s anaesthetic policy.
• Pack comforting items for the hospital stay: a favourite toy or blanket, familiar pyjamas, books, and a tablet or music for older children.
• Ask the team how the surgical site will be prepared. A small area of hair may be shaved or clipped; usually this is much smaller than parents expect.

Talking with your child

If your child is old enough to understand, an honest, simple explanation often helps. The language depends on age, but some general principles apply: name what is happening (“the doctors are going to help the fluid in your head flow the right way”), be truthful about what will hurt and what will not, explain that they will be asleep for the operation, and reassure them that you will be there when they wake up. Many children’s hospitals have play specialists who can help with this conversation.

What Happens During Surgery

On the day of surgery, your child will be admitted, weighed, and reviewed by the surgical and anaesthetic teams. You will usually be able to stay with your child until they are taken into the operating theatre. In many hospitals one parent can accompany the child until they are asleep.

During a VP shunt operation

1. Once asleep, your child is positioned carefully and a small area of the head and abdomen is cleaned and prepared.
2. A small incision is made in the scalp, and a small hole is made in the skull.
3. The ventricular catheter is passed gently through the brain into the ventricle. CSF flow is confirmed.
4. The valve is connected and placed under the scalp.
5. A separate small incision is made in the abdomen, and the distal catheter is tunnelled under the skin from the head to the abdomen.
6. The end of the catheter is placed inside the peritoneal cavity, where the body will absorb the fluid.
7. The incisions are closed with stitches or surgical glue.

During an ETV operation

1. Once asleep, your child is positioned, and a small area of scalp is prepared.
2. A small incision and a single small hole in the skull are made.
3. The endoscope is introduced and navigated into the third ventricle.
4. A small opening is made in the floor of the third ventricle and is gently widened so that it will stay open.
5. If choroid plexus cauterisation is part of the plan, the surgeon also uses the endoscope to reduce the CSF-producing tissue.
6. The endoscope is removed and the small incision is closed.

In the hospital

• First 24 hours: Your child is observed closely. They may be sleepy from the anaesthetic. Pain is usually well controlled with regular medicine.
• Feeding: Most children resume drinking and eating within a day, depending on their age and the surgeon’s instructions.
• Imaging: A CT scan, MRI, or ultrasound is often done within the first day or two to confirm that the shunt or ETV is positioned and working as expected.
• Wound care: The incision sites are kept clean and dry. The nursing team will explain what is normal swelling and what is not.

The first weeks at home

• Some swelling, bruising, or a small amount of clear fluid leakage from the wound can occur. Persistent leakage, redness spreading from the wound, fever, or increasing irritability should be reported to the surgical team.
• Bathing instructions vary. The team will usually advise keeping the incisions dry until they are well healed, then short showers, then full bathing.
• Most infants quickly return to their usual feeding and sleeping patterns. Older children may feel tired for a week or two.
• For children with VP shunts, parents will be taught how the valve feels under the skin, and what shunt malfunction signs to watch for.

Return to normal activities

• Nursery and school: Children typically return after a few weeks, once they are comfortable and the surgical team is satisfied with recovery.
• Play: Gentle play resumes early. Contact sports and activities that risk a direct blow to the head are usually restricted for a few weeks at minimum; long-term restrictions depend on the individual situation and the surgeon’s advice.
• Travel: Air travel is usually safe once the surgical team confirms healing, but plans should be discussed with the team beforehand.

Developmental support

For some children, hydrocephalus has already affected development by the time surgery is performed. Early intervention services — physiotherapy, occupational therapy, speech and language therapy, and developmental support — can be very helpful and are often coordinated through paediatric or community services. Your team can refer you to the appropriate services in your area.

Risks and Complications

All neurosurgery carries risk, even though both VP shunt and ETV are well-established procedures with generally good safety records in experienced pediatric neurosurgical units. Knowing the possible complications helps you recognise problems early.

Risks common to both procedures

• Bleeding within the brain or along the surgical path
• Infection — of the wound, of the device, or of the CSF (meningitis or ventriculitis)
• Seizures — uncommon but possible after any brain surgery
• Anaesthetic risks
• Injury to brain tissue along the surgical path

Risks specific to VP shunts

• Shunt blockage — the catheter or valve can become blocked, leading to a return of symptoms. This is one of the most common reasons for further surgery.
• Shunt infection — most likely in the first few months after placement. Treatment usually involves antibiotics and, often, temporary removal of the shunt.
• Over-drainage — if too much CSF is drained, the ventricles can become too small, causing headaches that are worse when upright, and in rare cases small bleeds called subdural collections. Programmable valves can often be adjusted to address this.
• Under-drainage — if not enough fluid is drained, symptoms of raised pressure can persist or return.
• Disconnection or fracture of the catheter — especially as a child grows.
• Abdominal complications — rarely, the distal catheter can cause an abdominal pseudocyst or other problems.

Risks specific to ETV

• Closure of the opening — the new pathway can close, particularly in the first six months, causing a return of symptoms.
• Injury to nearby structures — the floor of the third ventricle lies close to important blood vessels and nerves. Experienced pediatric neurosurgeons take great care to avoid these structures, but injury, although rare, is possible.
• CSF leak through the incision site.

When to call your child’s team after surgery

Contact the surgical team promptly if you notice:

• Fever, redness, or swelling at any incision
• Persistent vomiting
• Increasing sleepiness, irritability, or change in alertness
• A bulging soft spot in an infant
• New or worsening headaches in an older child
• Vision changes, including double vision or eyes drifting downward
• Seizures
• Fluid leaking from any incision
• Swelling along the line of the shunt tubing

If your child is severely unwell, very drowsy, or having a seizure, seek emergency care immediately.

Life After Pediatric Hydrocephalus Surgery

For most families, the operation is the beginning of a long-term partnership with a neurosurgical team. Children with shunts in particular need lifelong awareness of the device, because shunt problems can occur at any age.

Follow-up appointments and imaging

Routine follow-up usually involves clinic reviews and periodic imaging. The schedule depends on the procedure, the child’s age, and the underlying cause of hydrocephalus. After ETV, the team will pay particular attention to the first six to twelve months, when most failures occur. After shunt placement, the team will watch for any sign of malfunction and will repeat imaging when there are concerns.

Recognising shunt malfunction

• Headache, particularly persistent or worsening
• Vomiting, especially without other illness
• Drowsiness or unusual irritability
• Change in school performance or behaviour
• Vision changes
• Swelling, redness, or fluid along the shunt track
• In infants: a bulging fontanelle, head growing faster than expected, poor feeding

If shunt malfunction is suspected, the child should be assessed without delay, ideally at a hospital where the neurosurgical team can review them. Most malfunctions can be addressed with a relatively straightforward revision operation.

Living with a programmable valve

If your child has a programmable shunt valve, the surgical team will let you know what magnetic fields to avoid. MRI scans are generally safe but require the valve setting to be checked and, if needed, reset afterwards. Strong toy magnets, magnetic clasps, and certain medical devices are usually mentioned in the discharge information.

School and daily life

Most children with treated hydrocephalus attend mainstream school. Some may need extra support, particularly with attention, organisation, motor skills, or visuospatial tasks. Sharing the diagnosis with the school nurse and class teacher is usually helpful, so that staff know what shunt malfunction looks like and what to do.

For sports, most non-contact activities are encouraged. Contact sports and activities with a high risk of head injury are often discussed individually with the neurosurgical team. Swimming is generally allowed once wounds have fully healed.

Developmental and learning outcomes

Outcomes vary widely. Many children with hydrocephalus, particularly those whose surgery was performed early and whose underlying brain was not significantly injured, reach typical developmental milestones. Others may have learning differences, motor coordination challenges, or other needs related to the underlying cause of their hydrocephalus rather than the surgery itself. Regular developmental review and early intervention services can make a meaningful difference.

Future operations

It is important to know that shunts often need at least one revision over a child’s lifetime. This is not a sign that something has gone wrong with the original care; it is part of how shunts work over the years as a child grows and as components age. ETV can also fail and sometimes requires either repeat ETV or conversion to a shunt. None of this changes the fact that, for the great majority of children, treatment of hydrocephalus protects the brain and supports a full life.

Special Considerations

Premature infants

Babies born prematurely with post-haemorrhagic hydrocephalus are often very small and medically fragile. Surgeons may first use temporary measures — such as a ventricular access device or a ventriculo-subgaleal shunt — to relieve pressure while the baby grows and stabilises. A definitive VP shunt or, in selected cases, ETV-CPC is then performed when conditions allow. The neonatal and neurosurgical teams work closely together throughout this process.

Children with associated conditions

Hydrocephalus often occurs alongside other conditions, such as spina bifida, brain tumours, or genetic syndromes. In these children, the broader treatment plan involves multiple specialists — neurosurgery, neurology, urology, orthopaedics, oncology, rehabilitation, and others. Coordinated care helps families navigate appointments and ensures that all of the child’s needs are addressed.

The teenage years

As children with shunts or previous ETV grow into adolescents, they begin to take more responsibility for recognising their own symptoms and managing follow-up. Transition planning — moving from pediatric to adult neurosurgical care — usually starts in the mid-teens. Carrying information about the type of shunt and valve setting is helpful, especially when travelling.

Frequently Asked Questions

Will my child need a shunt for life?

If a VP shunt is placed, it usually stays in for life. In a small number of children, the shunt eventually becomes unnecessary — this is sometimes discovered when a shunt fails and the child has no return of symptoms — but this cannot be predicted in advance. ETV, by contrast, does not leave any device in the body, but it does not work for every type of hydrocephalus.

How is the choice between VP shunt and ETV made?

The choice is made by the neurosurgical team based on imaging, the cause of hydrocephalus, the child’s age, and previous treatments. ETV is more commonly considered for obstructive hydrocephalus in older infants and children, while VP shunt is often used for communicating hydrocephalus and for very young infants. Your team should explain why a particular approach is being recommended for your child.

Will my child be able to play sports?

Most non-contact sports are encouraged. Contact sports and activities with a high risk of head impact are usually discussed individually with the neurosurgical team. Helmets are recommended for cycling, skating, and similar activities for all children, and especially so for children with shunts.

Can my child have an MRI?

Yes. MRI is the main imaging used to monitor hydrocephalus. If your child has a programmable shunt valve, the valve setting needs to be checked after the scan and, if necessary, reset by the neurosurgical team or a trained technician.

What does shunt revision mean?

Shunt revision is a further operation to repair, replace, or reposition part of the shunt. It may be needed because of a blockage, infection, disconnection, or because the child has grown. Revision is one of the most common neurosurgical procedures in children with hydrocephalus and is usually a shorter operation than the original shunt insertion.

Will hydrocephalus affect my child’s intelligence and learning?

Outcomes vary. Many children reach typical milestones, particularly when the underlying brain is not injured and treatment is timely. Others may have specific learning differences. Regular developmental review and early support give children the best chance to develop their abilities fully.

Is hydrocephalus life-threatening if not treated?

Untreated hydrocephalus with rising pressure can cause serious brain injury and, in severe cases, can be life-threatening. This is why surgery is recommended when imaging and symptoms show that pressure is harming the brain.

Are there things we can do at home to support recovery?

Keeping incision sites clean and dry as instructed, attending follow-up appointments, learning the signs of shunt malfunction, engaging with early intervention or therapy services if offered, and sharing information with school and carers all help. Familiar routines, comforting items, and gentle play support a child’s emotional recovery as well.

Conclusion

Pediatric hydrocephalus surgery is a well-established treatment that protects the developing brain from the harm caused by raised pressure. The two main procedures — ventriculoperitoneal shunt placement and endoscopic third ventriculostomy — offer different routes to the same goal: allowing CSF to drain or bypass an obstruction so that the brain can grow and function.

The journey rarely ends in the operating theatre. Many children will need long-term follow-up, some will need revision surgery, and some will need developmental and educational support. With timely surgery, a clear plan for follow-up, and good communication between families and the neurosurgical team, most children with hydrocephalus go on to grow, learn, play, and find their own paths through childhood and beyond.