Hydrocephalus in Cats: Treatment and Can It Be Cured?

Name: Hydrocephalus in Cats: Treatment and Can It Be Cured?
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Hydrocephalus in cats treatment depends on the cause, the severity, and how quickly the condition is caught. Some cats live comfortably for years with medical management, while others need surgery to divert fluid away from the brain. True cure is uncommon because most cases require lifelong control of the underlying fluid buildup.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Hydrocephalus means excess cerebrospinal fluid (CSF) builds up inside or around the brain, pressing on brain tissue.
Treatment is either medical (medications that reduce fluid production) or surgical (a shunt that drains fluid to another part of the body).
Omeprazole is sometimes used off-label to reduce CSF production, but it does not cure hydrocephalus and its benefit is not well established in cats.
Shunt surgery can relieve pressure and improve quality of life, but shunts can clog, infect, or need revision.
Most cats with hydrocephalus need lifelong monitoring, and the outlook depends on the cause and how much brain damage has already occurred.

What Is Hydrocephalus in Cats?

Hydrocephalus is a buildup of cerebrospinal fluid within the ventricular system of the brain or in the spaces around it. CSF normally flows through the brain's chambers, bathes the brain and spinal cord, and gets absorbed back into the bloodstream. When that flow or absorption is blocked, fluid accumulates and pressure rises.

Veterinarians describe hydrocephalus as communicating or obstructive. Communicating means CSF can still flow between the ventricles but is not absorbed properly. Obstructive means something physically blocks the flow, such as a mass or a malformation. A recent case report described a young adult cat with an occipital bone abnormality and a chronic subdural hematoma that compressed the cerebellum and brainstem and caused obstructive hydrocephalus [1].

Some cats are born with hydrocephalus (congenital), and others develop it later (acquired). Congenital cases often show signs early in life, while acquired cases can appear at any age after an injury, infection, or tumor.

Signs Owners Notice

The signs of hydrocephalus vary with how fast pressure builds and which parts of the brain are compressed. Slow buildup may cause subtle changes that you attribute to personality or aging.

Common signs include:

A domed or rounded head shape, especially in kittens
Wide-set eyes or eyes that look downward
Unsteady walking, wobbling, or a wide-based stance
Head pressing or circling
Behavior changes such as lethargy, confusion, or reduced interaction
Poor appetite or weight loss
Seizures, in some cats

A 2-year-old cat in one report showed cautious ambulation, head shaking, and lethargy along with severe spinal pain [1]. A dog with severe congenital hydrocephalus developed a sudden change in mental status because the pressure affected the brain's thirst center [2]. Cats can develop similar complications when pressure disrupts normal brain regulation.

If your cat has a seizure that lasts more than a few minutes, or has repeated seizures, treat it as an emergency. You can read more about managing seizures in Feline Refractory Seizures: Diagnosis and Management.

Causes and Risk Factors

Hydrocephalus has many causes, and identifying the cause guides treatment.

Congenital causes. Kittens can be born with malformations that block CSF flow. Some brachycephalic breeds are overrepresented with ventricular enlargement, though the exact relationship between CSF flow dynamics and ventricular size is still being studied [3].

Infection and inflammation. Feline infectious peritonitis (FIP) can affect the nervous system. A 2025 case series followed four cats treated for neurologic FIP and found that three were re-presented with vestibular signs 13 to 15 months after treatment, and MRI showed progressive hydrocephalus in some of them [4]. This suggests that cats who survive neurologic FIP may develop hydrocephalus as a long-term complication.

Structural abnormalities. Masses, cysts, or abnormal blood vessel growth can block CSF flow. The cat with occipital bone angiomatosis is one example of a structural cause leading to obstructive hydrocephalus [1].

Trauma or bleeding. Head injury or bleeding into the brain spaces can impair CSF absorption.

Age. Congenital cases appear in young cats. Acquired cases can appear at any age.

How Hydrocephalus Is Diagnosed

Your veterinarian starts with a full history and neurologic examination. They will check your cat's gait, reflexes, eye movements, and mental status. They may also look for a domed head or other physical clues.

Advanced imaging is the main diagnostic tool. MRI is preferred because it shows the ventricles, brain tissue, and any masses or malformations. CT can also help, especially for bone abnormalities. In the cat with occipital angiomatosis, both MRI and CT were used to identify the bone changes and the subdural hematoma [1].

CSF analysis may be performed to look for infection or inflammation. In the dog with hydrocephalus and hypernatremia, CSF analysis was within normal limits, which helped rule out other causes [2]. Your veterinarian may also run blood work to check sodium and other electrolytes, since pressure on the brain can disrupt thirst and fluid regulation [2].

In some cases, your veterinarian may refer you to a veterinary neurologist or a specialty hospital for imaging and surgery.

Hydrocephalus in Cats Treatment: Medical vs Surgical Options

Treatment aims to reduce pressure on the brain and control signs. There is no single approach that works for every cat.

Medical Management

Medical management uses medications to reduce CSF production or to control symptoms. It is often the first choice for cats with mild signs, for cats who are not good surgical candidates, or when the underlying cause cannot be fixed.

Medications your veterinarian may consider include:

Diuretics such as furosemide or acetazolamide, which reduce fluid production
Corticosteroids to reduce inflammation and swelling around the brain
Anticonvulsants if your cat has seizures
Omeprazole, sometimes used off-label

Medical management does not cure hydrocephalus. It can slow progression and improve comfort, but it requires regular monitoring and dose adjustments. Your veterinarian calculates every dose based on your cat's weight, kidney function, and other health conditions.

Omeprazole for Hydrocephalus in Cats

Omeprazole is a proton pump inhibitor normally used for stomach acid. In veterinary neurology, it is sometimes used off-label because it may reduce CSF production by acting on the choroid plexus, the tissue that makes most of the CSF in the brain [5].

Here is what you should know:

Omeprazole does not cure hydrocephalus. It may reduce fluid production, but it does not fix the underlying blockage or absorption problem.
Its effectiveness in cats is not well established. Most research on targeting the choroid plexus has been done in rodent models, not cats [5].
It is used as part of medical management, often alongside other medications.
Your veterinarian will decide whether it is appropriate and will calculate the dose for your cat.

Do not give your cat omeprazole from your own supply without veterinary guidance. The dose and formulation matter, and some human products contain ingredients that are not safe for cats.

Shunt Surgery for Cats

Shunt surgery places a thin tube that drains CSF from the brain's ventricles to another part of the body, usually the abdomen. This is called CSF diversion, and it remains the main surgical treatment for hydrocephalus [5].

Shunt surgery can:

Relieve pressure on the brain
Improve mental status, gait, and comfort
Be life-saving in severe cases

Shunt surgery also has risks:

The shunt can become blocked or infected
It may need revision or replacement
It requires ongoing monitoring
Not every cat is a good candidate

Your veterinary surgeon will discuss whether your cat's specific anatomy and overall health make surgery a reasonable option. Some cats do well after surgery, while others continue to have signs because of existing brain damage.

Other Surgical Options

In some cases, the surgeon may address the underlying cause directly. For example, if a mass or bone abnormality is blocking CSF flow, removing or decompressing it may help. The cat with occipital angiomatosis had a structural cause that required surgical evaluation [1]. These cases are complex and are usually managed at specialty hospitals.

Treatment	What It Does	Cures Hydrocephalus?	Ongoing Needs
Medical management	Reduces CSF production and controls signs	No	Lifelong medication and monitoring
Omeprazole	May reduce CSF production via choroid plexus	No	Used with other medications, dose set by vet
Shunt surgery	Diverts CSF away from the brain	No, but can control pressure	Monitoring for blockage or infection
Treating the cause	Removes or relieves a blockage	Sometimes, if cause is fixable	Depends on the cause

Recovery, Outlook, and Long-Term Management

The outlook for a cat with hydrocephalus depends on the cause, how much brain damage has occurred, and how well the cat responds to treatment.

Cats with mild congenital hydrocephalus may live for years with medical management and regular checkups. Cats with severe or progressive hydrocephalus may have a shorter lifespan and a lower quality of life.

After shunt surgery, many cats improve within days to weeks. But shunts are not permanent fixes. They can fail, and your cat will need periodic imaging or examinations to check the shunt. Your veterinarian will set a monitoring schedule based on your cat's condition.

Long-term management may include:

Regular neurologic examinations
Blood work to check electrolytes and organ function
Medication adjustments as your cat grows or their condition changes
Watching for new or worsening signs
Keeping your cat indoors and reducing stress

If your cat has trouble eating or drinking, or if they become dehydrated, they may need fluid therapy. You can read more about that in Fluid Therapy Guidelines for Dogs and Cats: A Practical Update.

Some cats with hydrocephalus also have other health issues. Dental disease, for example, can make eating painful and worsen weight loss. If your cat needs dental care, see How To Treat Dental Disease In Cats.

Prevention

Most cases of hydrocephalus cannot be prevented because they are congenital or caused by conditions you cannot control.

What you can do:

Keep your cat indoors to reduce the risk of head trauma
Keep vaccinations up to date, especially against feline panleukopenia virus, which can cause brain malformations in kittens
Treat infections promptly
If you adopt a kitten with a domed head or unusual gait, have them examined by a veterinarian early
If your cat has FIP, follow up with your veterinarian regularly, since hydrocephalus can develop months after treatment [4]

There is no diet, supplement, or home remedy that prevents or treats hydrocephalus. Be cautious of anyone who claims otherwise.

Limitations and When to Contact a Veterinarian

Hydrocephalus is a serious condition, and individual cases need a veterinarian who can examine your cat and review imaging. No article can replace that.

Contact your veterinarian or an emergency clinic right away if your cat:

Has a seizure that lasts more than a few minutes, or has more than one seizure in 24 hours
Cannot stand or walk
Becomes suddenly confused, unresponsive, or difficult to wake
Shows head pressing or circling that is new or worsening
Stops eating or drinking
Vomits repeatedly or seems dehydrated
Has a shunt that is swollen, red, or leaking

Call your veterinarian the same day if your cat:

Has a sudden change in behavior or mental status
Develops a head tilt, wobble, or unsteady gait
Has eye changes such as wide-set eyes or a downward gaze
Seems to be in pain

Schedule a routine visit if your cat has a known diagnosis of hydrocephalus and you notice any new sign, even if it seems mild. Early changes are easier to manage than advanced ones.

Frequently Asked Questions

Can hydrocephalus in cats be cured?

In most cases, hydrocephalus cannot be cured. Treatment can control pressure and improve quality of life, but the underlying cause often remains. If the cause is a fixable blockage, surgery may resolve it, but many cats need lifelong management.

Is omeprazole safe for cats with hydrocephalus?

Omeprazole is sometimes used off-label in cats with hydrocephalus, but its benefit is not well established. Your veterinarian should decide whether it is appropriate and calculate the dose for your cat. Do not give human omeprazole without veterinary guidance.

How long can a cat live with hydrocephalus?

Survival varies widely. Some cats with mild hydrocephalus live for years with medical management, while others with severe or progressive disease have a much shorter lifespan. Your veterinarian can give you a more specific outlook after examining your cat and reviewing imaging.

Does shunt surgery cure hydrocephalus in cats?

Shunt surgery does not cure hydrocephalus, but it can relieve pressure and improve signs. Shunts can clog, infect, or need revision, so your cat will need ongoing monitoring. Surgery is one tool, not a permanent fix.

What should I feed a cat with hydrocephalus?

There is no specific diet for hydrocephalus. Your cat needs balanced nutrition and enough water to stay hydrated. If your cat has trouble eating, your veterinarian may recommend a softer food or a feeding plan. Always follow your veterinarian's advice for your cat's individual needs.

References

Occipital Bone Angiomatosis and Chronic Subdural Hematoma Causing Severe Cerebellar and Brainstem Compression and Obstructive Hydrocephalus in a Young Adult Cat. Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association, 2026.
Case Report: Hypodipsic hypernatremia secondary to hydrocephalus in a dog. Frontiers in veterinary science, 2025.
CSF flow measurement in the mesencephalic aqueduct using 2D cine phase-contrast MRI in dogs with communicating internal hydrocephalus, ventriculomegaly, and physiologic ventricular spaces. Frontiers in veterinary science, 2024.
Post feline infectious peritonitis progressive hydrocephalus: a case series. Frontiers in veterinary science, 2025.
Exploring and translating novel approaches targeting the choroid plexus for the treatment of hydrocephalus: a literature review. Fluids and barriers of the CNS, 2026.