Hydrocephalus is treated primarily through surgery that redirects excess cerebrospinal fluid (CSF) away from the brain. There is no cure, and medication plays only a temporary role at best. The two main surgical options are shunt implantation and a minimally invasive procedure that creates a new drainage pathway inside the brain. Which approach is right depends on age, the cause of the fluid buildup, and the specific anatomy involved.
Shunt Systems: The Most Common Treatment
The majority of people with hydrocephalus are treated with a shunt, a device implanted entirely under the skin that drains excess fluid from the brain to another part of the body where it can be absorbed naturally. The most common type routes fluid to the abdomen (a ventriculoperitoneal, or VP, shunt), though some systems drain to the heart instead.
A shunt has three main components: an inflow catheter placed inside a fluid-filled chamber of the brain, a valve that regulates how much fluid passes through, and an outflow catheter that carries the fluid to the abdomen or heart. The valve is the key piece. It opens when pressure in the brain rises above a set threshold and closes again once enough fluid has drained. Modern programmable valves can be adjusted after surgery using an external magnet, without any additional operation. This lets doctors fine-tune the drainage pressure over time, typically adjusting in small increments every two to three weeks until symptoms improve and the brain’s fluid chambers return closer to normal size.
A typical hospital stay after shunt placement is two to four days. Recovery from there varies, but most people gradually resume normal activities over the following weeks.
Endoscopic Third Ventriculostomy
Endoscopic third ventriculostomy (ETV) is a shunt-free alternative that works best when hydrocephalus is caused by a blockage inside the brain’s fluid pathways. A surgeon uses a small camera threaded through a tiny opening in the skull to create a new hole in the floor of the brain’s third ventricle. This allows trapped fluid to bypass the blockage and flow to areas where it can be absorbed normally.
The advantage of ETV is that it avoids implanting hardware, which eliminates the long-term risks associated with a shunt. The limitation is that it only works in certain types of hydrocephalus, particularly obstructive cases where there is a clear blockage. It also requires enough anatomical space between brain structures and blood vessels to make the opening safely, which surgeons assess with detailed imaging beforehand.
ETV Combined With Choroid Plexus Cauterization in Infants
For infants, surgeons sometimes combine ETV with cauterization of the choroid plexus, the tissue inside the brain that produces cerebrospinal fluid. Reducing the amount of fluid produced can improve the odds that the new drainage opening will be sufficient on its own. A large prospective study from the Hydrocephalus Clinical Research Network found that this combined procedure was successful in about 45% of infants at 18 months. Infants younger than one month and those whose hydrocephalus resulted from bleeding related to premature birth had higher failure rates. In select subgroups based on age and cause, success rates were notably better, so the decision to try this approach depends heavily on the individual case.
Can Medication Treat Hydrocephalus?
Medication is not effective as a long-term treatment. Drugs that reduce fluid production in the brain are sometimes used as a temporary bridge in newborns with hydrocephalus caused by bleeding, or in situations where surgery must be delayed. But these medications can cause metabolic side effects and are not a substitute for surgical treatment. They should not be used in patients who already have a functioning shunt.
Normal Pressure Hydrocephalus in Older Adults
Normal pressure hydrocephalus (NPH) is a distinct form that typically affects people over 60. It causes a recognizable triad of symptoms: difficulty walking, cognitive decline, and urinary incontinence. Because these symptoms overlap with other conditions like dementia or Parkinson’s disease, NPH is often misdiagnosed or missed entirely.
Treatment is a shunt, but the challenge is predicting who will actually improve after surgery. Several tests help gauge the likelihood of a good response. A large-volume spinal tap, where a significant amount of fluid is removed at once, can produce temporary symptom improvement. If walking or thinking gets noticeably better in the hours or days after the tap, shunting is more likely to help. Extended lumbar drainage over several days provides a longer trial. Imaging that shows high-velocity fluid flow through a specific brain channel also points toward a favorable outcome.
Patients with fewer other health problems tend to do better. Those with significant underlying Alzheimer’s disease pathology are less likely to improve after shunting. Overall, roughly two-thirds of NPH patients respond well to a shunt, and that number climbs to about 83% among those with few coexisting medical conditions. Increasing age alone does not reduce the chance of success.
Shunt Failure and Revision Surgery
Shunts are life-sustaining devices, but they are not permanent in the way a hip replacement might be. They can become blocked, disconnected, or infected, and when they do, they need to be surgically revised or replaced. In children, the one-year revision rate is approximately 36%, and about two-thirds of all revisions happen within that first year. Over longer follow-up (averaging about six years), more than half of pediatric patients require at least one revision.
Knowing the signs of a malfunctioning shunt is critical for anyone living with one. In infants and young children, warning signs include a bulging soft spot on the skull, prominent scalp veins, eyes that drift downward (“sunset eyes”), poor feeding, vomiting, irritability, and unusual sleepiness. In older children, teens, and adults, symptoms of malfunction include persistent headaches, nausea and vomiting, double vision, difficulty walking, personality changes, seizures, and incontinence.
Shunt infections typically cause a low-grade fever, soreness in the neck or shoulder muscles, and redness or tenderness along the path of the tubing under the skin. Infections are a serious complication. Antibiotic-impregnated catheters, which slowly release antibiotics from the tubing itself, have been shown to cut infection rates roughly in half, from about 8% down to about 4%. Many surgical centers now use these as standard.
Living With a Shunt
For most people, a well-functioning shunt allows a return to normal or near-normal life. Programmable valves do require some awareness. Strong magnets, including those in MRI machines, can potentially reset the valve’s pressure setting, so your care team will check the valve after any MRI scan and readjust it if needed. Routine follow-up appointments typically include imaging to monitor ventricle size and verify the shunt is draining properly.
Because shunt failure can happen at any time, even years after the original surgery, people with shunts need to remain alert to the warning symptoms described above. Rapid onset of headache, vomiting, or sudden changes in consciousness should be treated as a medical emergency, since uncontrolled pressure buildup in the brain can become dangerous quickly. Many patients and families find it helpful to carry a card or wear a medical alert bracelet that identifies them as having a shunt, so emergency responders know to consider malfunction as a possible cause of acute symptoms.