Hydrocephalus (Water on the Brain)

Understanding hydrocephalus — causes, symptoms, and surgical treatment options available in Lahore, Pakistan

What is Hydrocephalus?

Hydrocephalus is a build-up of cerebrospinal fluid (CSF) inside the cavities (ventricles) of the brain. CSF is normally produced, circulated, and reabsorbed in a continuous cycle; when this cycle is disrupted — either because fluid cannot drain properly or is produced faster than it is absorbed — it accumulates and increases pressure inside the skull. The word hydrocephalus comes from the Greek words for "water" and "brain."

In Pakistan, hydrocephalus is commonly seen in newborns and infants due to congenital causes, as well as in children following meningitis, intraventricular hemorrhage of prematurity, or head injury. Adults can develop hydrocephalus from brain tumors, bleeding, infection, or the aging process (Normal Pressure Hydrocephalus). The right treatment and long-term outlook depend heavily on which of these patterns applies — which is why an accurate diagnosis matters as much as the surgery itself.

Is My Baby's Head Growing Too Fast? Warning Signs Parents Miss

Every baby's head grows in the first year of life, which is exactly why abnormal growth is often missed — parents and even some clinicians assume a large head is simply the child's build. The key difference is the rate of growth: in hydrocephalus, head circumference crosses upward across growth-chart centiles month after month, rather than tracking a steady curve. Pediatricians who plot head circumference at every visit are far more likely to catch this early.

Early Warning Signs in Infants

  • Head circumference crossing growth centiles
  • Bulging, tense soft spot (fontanelle)
  • Prominent, visibly engorged scalp veins
  • Downward "sunset" gaze
  • Irritability & high-pitched cry
  • Poor feeding & frequent vomiting
  • Sleepiness or reduced activity

Symptoms in Adults

  • Headache (especially on waking)
  • Nausea & vomiting
  • Balance & walking problems
  • Cognitive decline
  • Urinary incontinence (NPH)
  • Blurred or double vision
  • Sudden drowsiness (emergency)

A useful rule for parents: if the head seems to be "outgrowing" the rest of the baby's growth, or if a soft spot that is normally soft and slightly sunken becomes tense and bulging even when the baby is calm, this is not something to watch and wait on — it should be checked with a head ultrasound (in infants under about 6 months, while the fontanelle is still open) or a CT/MRI scan.

Congenital vs Acquired Hydrocephalus in Children

Not all pediatric hydrocephalus is the same, and the cause affects both urgency and treatment planning. Congenital hydrocephalus is present at birth, often related to aqueductal stenosis, neural tube defects such as spina bifida (myelomeningocele), or Dandy-Walker malformation, and in many cases can be detected on a prenatal ultrasound during pregnancy — allowing parents and the medical team to plan delivery and early neurosurgical care in advance. Acquired hydrocephalus develops after birth, most often following meningitis, intraventricular hemorrhage in premature infants, head trauma, or a brain tumor obstructing CSF flow. Acquired cases can progress rapidly, so any infant recovering from meningitis or a difficult premature birth should have head circumference and neurological status monitored closely in the weeks that follow.

Normal Pressure Hydrocephalus in Elderly Patients — Often Misdiagnosed as Dementia

Normal Pressure Hydrocephalus (NPH) is a form of adult hydrocephalus that typically develops gradually after age 60, and it is one of the most under-recognized treatable causes of "dementia" in older adults. Unlike acute hydrocephalus, CSF pressure on standard measurement is often within a "normal" range, yet the ventricles are enlarged and gradually compress surrounding brain tissue — hence the name.

NPH classically presents with a triad of symptoms that clinicians remember as "wet, wacky, and wobbly": urinary incontinence, cognitive decline (memory problems, slowed thinking, reduced attention), and a gait disturbance — a broad-based, shuffling, "magnetic" walk where the feet seem stuck to the floor. Because this looks so similar to Alzheimer's disease or Parkinson's disease, NPH is frequently missed or misdiagnosed for months or years, and patients are sometimes treated for the wrong condition while a reversible cause of their decline goes untreated.

The distinguishing clue is usually the gait problem appearing early and prominently, often before or alongside the memory issues, whereas in Alzheimer's disease memory loss typically comes first. If NPH is suspected, a CT or MRI showing enlarged ventricles out of proportion to any cortical atrophy, followed by a lumbar puncture "tap test," can confirm the diagnosis — and importantly, many patients who respond to a tap test go on to have significant, sometimes dramatic, improvement in walking and thinking after a VP shunt is placed.

What Causes Hydrocephalus?

Congenital (born with it)
Post-meningitis / infection
Intraventricular hemorrhage
Brain tumor blocking CSF
Aqueductal stenosis
Normal Pressure Hydrocephalus
Head injury / trauma
Prematurity-related bleeding
Spina bifida (myelomeningocele)

Hydrocephalus Diagnosis: What Tests Are Needed?

Accurate diagnosis of hydrocephalus relies on a combination of clinical examination and imaging, and the right test depends on the patient's age and presentation:

CT Scan vs MRI Brain

A CT scan is fast and widely available, making it the first choice in emergencies or when a quick answer is needed — for example, sudden headache with vomiting. MRI gives far more detailed images of brain structure, is free of radiation (important for children who may need repeat imaging), and is better at showing the underlying cause, such as a tumor, aqueductal stenosis, or a Chiari malformation. Both scans measure ventricle size and help plan the safest surgical approach.

Prenatal Ultrasound

Congenital hydrocephalus can often be detected during routine prenatal ultrasound scans in the second or third trimester, when enlarged fetal ventricles are seen. This allows the family and medical team to plan the delivery, arrange fetal MRI if needed, and prepare for early neurosurgical evaluation soon after birth.

Lumbar Puncture / Tap Test (for NPH)

In suspected Normal Pressure Hydrocephalus, a lumbar puncture removes a measured volume of CSF, and the patient's walking, balance, and thinking are assessed before and after. Noticeable improvement after fluid removal — the "tap test" — is a strong predictor that the patient will respond well to a permanent VP shunt.

Intracranial Pressure (ICP) Monitoring

In selected complex or unclear cases — particularly in adults with atypical symptoms — continuous ICP monitoring over 24–72 hours (via a small sensor placed in the brain or an external ventricular drain) can capture pressure patterns that a single scan cannot, helping confirm whether shunt surgery is likely to help.

VP Shunt vs ETV — Which Treatment Is Right?

VP Shunt Surgery

A thin silicone tube (shunt) is placed inside the brain's ventricle and tunneled under the skin down to the abdomen (peritoneal cavity), where the CSF is safely reabsorbed by the body. A pressure-regulating valve controls the rate of drainage. This is the most commonly used and most broadly applicable treatment for hydrocephalus in Pakistan, suitable for almost every cause and age group, from newborns to elderly NPH patients.

Endoscopic Third Ventriculostomy (ETV)

A minimally invasive procedure using a small camera (endoscope) inserted through a single small opening in the skull to create a new opening in the floor of the third ventricle — allowing CSF to bypass the blockage and flow through its natural pathways again. ETV is suitable specifically for obstructive hydrocephalus (where a blockage, such as aqueductal stenosis, is preventing normal flow) and avoids implanting any permanent hardware. It is not appropriate for every patient — communicating hydrocephalus and NPH generally do not respond to ETV and require a shunt instead.

Dr. Waqas Mehdi decides between VP shunt and ETV based on the underlying cause, the location of any blockage on imaging, the patient's age, and overall clinical picture — there is no one-size-fits-all answer, which is why proper imaging and evaluation come before any treatment recommendation.

What Happens During VP Shunt Surgery?

VP shunt surgery is performed under general anesthesia and typically takes 45–90 minutes. A small incision is made in the scalp, and a fine catheter is guided into the enlarged ventricle to drain the excess CSF. This catheter is connected under the skin to a valve (which regulates how much fluid drains and at what pressure) and then to a second, longer catheter that is tunneled under the skin — behind the ear, down the neck and chest — to reach the abdomen, where the tube is placed inside the peritoneal cavity so the fluid can be reabsorbed naturally by the body.

Patients are usually monitored in hospital for 2–4 days after surgery. In infants and children, relief of pressure symptoms (irritability, vomiting, tense fontanelle) is often noticeable within the first day or two. In adults, headaches and nausea typically improve quickly, though NPH patients may see gait and cognitive improvement unfold more gradually over weeks. A follow-up CT or MRI is usually done a few weeks after surgery to confirm the shunt is working and the ventricles have reduced in size.

Life After a VP Shunt — What to Expect

A properly functioning VP shunt allows most patients — including children — to return to a full, active life, including school, sports, and normal activity, though contact sports are usually discussed individually with the neurosurgeon. Shunts can, however, malfunction over time due to blockage, infection, or mechanical issues such as disconnection or the tubing becoming too short as a child grows, so lifelong awareness of warning signs matters even years after successful surgery.

Families should watch for a return of the original symptoms — headache, vomiting, irritability, lethargy, or in infants a bulging fontanelle and rapid head growth — as well as fever, redness or swelling along the shunt tract under the skin, new seizures, or unexplained behavioural change. Shunt malfunction is a neurosurgical emergency and should be assessed the same day, not scheduled for a routine follow-up visit. When a shunt does fail, revision surgery — replacing or repairing the blocked or malfunctioning component — is usually straightforward and restores normal function. Some patients, particularly children, will need one or more shunt revisions over their lifetime as they grow or as hardware wears; this is a normal part of long-term shunt care rather than a sign that anything went wrong with the original surgery.

Frequently Asked Questions

What are the signs of hydrocephalus in a baby?
In infants, hydrocephalus commonly presents with a rapid increase in head size (crossing growth-chart centiles), a bulging soft spot (fontanelle) that doesn't soften when the baby is calm and upright, visible enlarged scalp veins, a downward 'sunset' gaze, irritability, poor feeding, and vomiting. Any of these signs — especially a head circumference that is growing faster than the rest of the body — warrant prompt neurosurgical evaluation and a head ultrasound or CT/MRI.
Who is the best doctor for hydrocephalus treatment in Lahore?
Dr. Waqas Mehdi, FCPS Neurosurgeon and Assistant Professor at King Edward Medical University (KEMU) and Mayo Hospital, Lahore, is widely regarded as one of the best neurosurgeons in Lahore for hydrocephalus treatment in both children and adults, having performed hundreds of VP shunt surgeries and ETV procedures at Mayo Hospital and MidCity Hospital.
What is the difference between VP shunt surgery and ETV?
VP shunt surgery places a thin silicone tube from the brain's ventricle to the abdomen to continuously drain excess CSF, and is the most commonly used treatment in Pakistan for most types of hydrocephalus. ETV is a minimally invasive endoscopic procedure that creates a new drainage pathway so CSF can bypass the blockage naturally, avoiding permanent hardware implantation — but it only works for a specific subset of patients with obstructive hydrocephalus. Dr. Waqas Mehdi will tell you honestly which option applies to your case after reviewing your scans.
What causes hydrocephalus in adults?
In adults, hydrocephalus can result from brain tumors blocking CSF flow, intraventricular or subarachnoid hemorrhage, head injury, meningitis, aqueductal stenosis, or the aging process, known as Normal Pressure Hydrocephalus (NPH), which causes headaches, balance and walking problems, cognitive decline, and urinary incontinence.
Is hydrocephalus dangerous?
Yes, if left untreated — the excess fluid pressure can progressively damage brain tissue, and in infants can affect development if the head size isn't controlled. However, hydrocephalus is also one of the most treatable conditions in neurosurgery: with a timely VP shunt or ETV, most patients — children and adults — go on to live full, normal lives. The danger comes specifically from delayed diagnosis and treatment, not from the condition being inherently untreatable.
Is hydrocephalus a medical emergency?
Untreated hydrocephalus causes progressive and potentially irreversible brain damage due to rising pressure inside the skull. A rapidly growing head in an infant, sudden severe headache with vomiting, or new confusion/drowsiness in an adult require urgent evaluation and treatment by a neurosurgeon — do not wait for a routine appointment.
How much does VP shunt surgery cost in Lahore?
The cost of VP shunt surgery in Lahore varies depending on the hospital, the type of shunt system used, length of hospital stay, and whether any additional imaging or ICU care is required. Because every patient's situation is different, we don't quote a fixed figure online — please call 0300-8482624 or visit the clinic so Dr. Waqas Mehdi's team can review your case and give you an accurate estimate.
Can hydrocephalus be prevented?
Congenital hydrocephalus generally cannot be prevented, though good prenatal care and timely treatment of maternal infections reduce some risks. Acquired hydrocephalus can sometimes be reduced by promptly treating meningitis and other CNS infections, wearing helmets to prevent head injury, controlling risk factors for stroke and hemorrhage, and seeking early treatment for brain tumors. Regular follow-up after any brain surgery, hemorrhage, or meningitis episode allows hydrocephalus to be caught and treated early if it develops.
What are the signs of a blocked or failed shunt?
Warning signs of shunt malfunction include return of the original symptoms (headache, vomiting, irritability, lethargy), swelling or redness along the shunt tract, fever, a bulging fontanelle in infants, sudden behavioural change, worsening balance, or new seizures. Shunt malfunction is a neurosurgical emergency — if you notice any of these signs in yourself or your child, contact Dr. Waqas Mehdi's clinic or go to the nearest emergency department immediately rather than waiting to see if symptoms settle.
Can adults develop hydrocephalus suddenly?
Yes. Adults can develop acute hydrocephalus suddenly after a brain hemorrhage, severe head injury, meningitis, or from a rapidly growing tumor blocking CSF flow. This is different from the slow, gradual onset typical of Normal Pressure Hydrocephalus in the elderly. Sudden-onset hydrocephalus causes rapidly worsening headache, vomiting, drowsiness, and can be life-threatening — it requires emergency neurosurgical assessment, often with urgent CT imaging and, if needed, an emergency external ventricular drain or shunt.

Urgent: Hydrocephalus Needs Prompt Treatment

Untreated hydrocephalus causes progressive brain damage. If your child has a rapidly growing head or you have symptoms, contact Dr. Waqas Mehdi immediately.

Call 0300-8482624VP Shunt & ETV Surgery →

Consult Dr. Waqas Mehdi Today

Pakistan's trusted neurosurgeon for brain tumor surgery, spine surgery, and all complex neurological conditions. Book your appointment at MidCity Hospital, Lahore.

Call: 0300-8482624Book Appointment Online