Hydrocephalus is treated almost exclusively through surgery. No medication can permanently resolve the buildup of cerebrospinal fluid (CSF) in the brain’s ventricles, so treatment focuses on either diverting that fluid to another part of the body or creating a new drainage pathway inside the brain itself. The specific approach depends on what type of hydrocephalus you have, your age, and what’s causing the blockage.
Shunt Placement: The Most Common Treatment
The majority of hydrocephalus cases are treated with a shunt, a system of thin tubing that drains excess fluid from the brain’s ventricles to another body cavity where it can be safely absorbed. The most common version is a ventriculoperitoneal (VP) shunt, which routes fluid from the brain to the abdominal cavity. A shunt has three parts: a catheter placed inside a brain ventricle, a one-way valve that controls flow, and a second catheter that carries the fluid to its destination.
During surgery, a small hole is drilled in the skull and a catheter is threaded into one of the brain’s lateral ventricles, typically on the right side to avoid the dominant hemisphere. The catheter connects to a valve positioned just under the scalp, and a second length of tubing is tunneled beneath the skin down the neck and chest into the abdomen. The entire system sits under the skin and isn’t visible from the outside, though you can sometimes feel the valve behind the ear.
If the abdominal cavity isn’t suitable, surgeons can route the distal catheter to the heart (via a neck vein), the chest cavity, or rarely the urinary system.
Fixed vs. Programmable Valves
The valve is the critical component. Fixed-pressure valves are set to open at a specific pressure level (low, medium, or high) chosen before surgery. Programmable valves can be adjusted after implantation using an external magnetic device, which lets doctors fine-tune drainage without another operation. In theory, programmable valves should produce better outcomes since they can be recalibrated as conditions change. In practice, studies comparing the two in normal pressure hydrocephalus patients have found no significant difference in clinical improvement or complication rates at six months. Roughly 18 to 21 percent of patients experience shunt-related complications regardless of valve type, with excessive drainage and subdural fluid collections being the most common problems.
Endoscopic Third Ventriculostomy
For certain types of hydrocephalus, surgeons can skip the shunt entirely. Endoscopic third ventriculostomy (ETV) involves using a tiny camera threaded into the brain’s ventricles to create a small hole in the floor of the third ventricle. This new opening lets cerebrospinal fluid bypass whatever blockage exists and drain naturally into the spaces around the brain, where it’s reabsorbed.
ETV works best when the blockage is at a specific point in the fluid pathway, particularly in aqueductal stenosis, where the narrow channel connecting the third and fourth ventricles is blocked. It’s the preferred first-line treatment for infants under 12 months with congenital aqueductal stenosis, for children with non-tumor obstructive hydrocephalus (unless there’s severe head enlargement), and for elderly patients with normal pressure hydrocephalus. Computer simulations and clinical follow-up data consistently show ETV outperforms shunting in aqueductal stenosis cases.
ETV is less effective for communicating hydrocephalus, where no single blockage point exists, and for hydrocephalus following brain hemorrhage in premature infants. In patients under 19 with brain tumors causing hydrocephalus, shunt failure tends to happen later than ETV failure, making shunts the more durable choice in that group.
Adding Choroid Plexus Cauterization
In some infants, ETV is combined with choroid plexus cauterization (CPC), a procedure that uses heat to shrink the tissue inside the ventricles that produces cerebrospinal fluid. By reducing fluid production and creating a new drainage route at the same time, the combination achieves higher rates of shunt independence than ETV alone. Success is more likely in infants older than one month and when more than 90 percent of the choroid plexus is cauterized. This combined approach gained traction after producing strong results in sub-Saharan Africa and has since become more widely adopted globally.
Medication as a Temporary Bridge
Drugs that reduce cerebrospinal fluid production can sometimes buy time, though they don’t replace surgery. A combination of acetazolamide (which slows fluid production) and furosemide (a diuretic) has been used in infants to halt the progression of hydrocephalus long enough for the skull’s growth plates to fuse, at which point the condition may stabilize on its own. This approach is reserved for specific clinical situations and is not considered a long-term solution for most patients.
Shunt Failure and Revision Surgery
Shunts are effective but far from permanent. The estimated failure rate is 11 to 25 percent during the first year after placement, and about 30 percent of shunt patients eventually need revision surgery due to malfunction. In one five-year study of over 400 shunt placements, nearly a quarter of all revisions happened within 30 days of the initial procedure.
Shunts can fail for several reasons: the tubing can become blocked by tissue or debris, the catheter can shift out of position as a child grows, or the system can become disconnected. Recognizing failure early is critical. Warning signs include:
- In infants: a bulging soft spot on the head, rapid head growth, irritability, fluid collection along the shunt tract
- In older children and adults: headaches, nausea and vomiting, decreased alertness, abdominal pain
A shunt that feels difficult to pump (you can press the valve reservoir behind the ear) is another red flag. If you or your child has a shunt and any of these symptoms develop, it requires urgent evaluation.
Infection Risk After Surgery
Shunt infection is one of the most serious complications. Infection rates generally fall between 5 and 17 percent, with a large U.S. pediatric study finding an average of 11.7 percent per patient over one year. The most common culprit is Staphylococcus bacteria, responsible for about 60 percent of shunt infections. The median time to infection is around two months after placement.
All patients receive preventive antibiotics before shunt surgery. When an infection does occur, it typically requires removing the infected shunt, treating with antibiotics, and placing a new shunt once the infection clears. This means additional surgeries and a longer overall recovery.
Recovery and Long-Term Outcomes
Hospital stays after shunt placement are typically a few days, assuming no complications. The surgical wounds on the head and abdomen heal over several weeks, during which you’ll need to keep them clean and dry. Most surgeons recommend avoiding contact sports and activities that risk head impact for several weeks after surgery, and some advise long-term caution with high-impact activities for patients with shunts in place.
Functional improvement after treatment varies by the type of hydrocephalus. For adults with normal pressure hydrocephalus, walking ability tends to respond first and most dramatically. In clinical testing, patients showed significant improvement in walking speed, walking endurance, and the ability to stand from a seated position within three months of shunt placement, and those gains held at six months. Gait velocity specifically increased by about 23 percent, driven mainly by longer strides. Daily activity levels also improved: patients roughly doubled their average steps per minute over six months.
Cognitive symptoms in normal pressure hydrocephalus are slower to recover and may not fully resolve. Bladder control problems, the third hallmark symptom of the condition, typically fall somewhere in between. The earlier treatment happens after symptoms begin, the better the chances of meaningful recovery across all three domains.
For children treated for hydrocephalus, long-term outcomes depend heavily on the underlying cause, whether there’s been any brain damage, and how quickly treatment was initiated. Many children with shunts lead full, active lives, though they’ll need lifelong monitoring since shunts can malfunction at any age, and most people will need at least one revision over their lifetime.