Brain Tumours in Cats: Symptoms, Tests and Treatment Choices
In this article
By Dr Duncan Houston
Hearing that your cat may have a brain tumour is frightening, particularly when the first sign is a seizure or a sudden change in behaviour. A suspected tumour is not yet a complete diagnosis, and different tumour types can have very different treatment options.
The most useful next steps are to stabilise urgent problems, understand what the tests show and agree on goals that fit your cat's health and comfort.
Quick Answer
Brain tumours can cause seizures, circling, altered behaviour, weakness or vision changes, but other illnesses can cause similar signs. MRI helps locate a lesion and suggest its nature; tissue examination is usually needed for a definitive tumour diagnosis. Surgery, radiation, selected drug treatments or palliative care may be considered depending on tumour type, location and the cat's overall condition.
Not all brain tumours behave alike
A primary tumour starts within the brain or its associated structures. A secondary tumour spreads from cancer elsewhere in the body. Cancer may also grow directly into the skull from nearby tissues; this is different from distant spread.
Meningiomas arise from the membranes around the brain and are an important tumour type in cats. Some are accessible for surgical removal. Gliomas arise from supporting cells within the nervous system and can infiltrate brain tissue, making surgery more difficult. Lymphoma requires a different discussion about diagnosis and systemic treatment.
Cornell's neurological disorders guidance describes meningiomas and other feline neurological conditions. A review of primary feline central nervous system tumours explores the distinctions between tumour types; the label “brain tumour” alone is too broad to predict an outcome.
What signs should owners watch for?
Changes can develop gradually or become noticeable suddenly. Record when they started, whether they are progressing and how your cat behaves between episodes.
- A first seizure or increasing seizure frequency.
- Persistent circling, disorientation or becoming stuck in corners.
- Changes in sleep, interaction or normal household routines.
- Stumbling, weakness or difficulty coordinating movement.
- Apparent blindness or altered eye movements.
These signs do not identify a particular tumour. High blood pressure, eye disease, metabolic disorders, toxins, inflammation, infection and vascular problems can also affect behaviour or neurological function. Some require a very different treatment plan.
How diagnosis is built
| Step | Purpose | What it cannot establish alone |
|---|---|---|
| History and examination | Identify affected functions and urgent needs | Exact tumour type |
| Blood, urine and blood pressure testing | Check systemic causes and general health | Whether every brain lesion is absent |
| MRI, or selected CT imaging | Locate a lesion and assess surrounding structures | Definitive tissue identity in every case |
| Biopsy or surgical tissue analysis | Classify the tumour when feasible | A guaranteed response to treatment |
A study of MRI findings in cats with intracranial tumours supports imaging as an important diagnostic tool, while illustrating the distinction between a scan interpretation and a confirmed pathological diagnosis.
Your vet may recommend chest or abdominal assessment if another cancer site is suspected. Cerebrospinal fluid sampling is selected carefully after considering imaging and pressure-related risks. The MSD Veterinary Manual explains why collecting fluid may be unsafe in some animals with a brain mass.
Treatment choices and questions to ask
Surgery: an accessible meningioma may be a reasonable surgical candidate, but location, anaesthetic health and the risk of neurological complications matter. Ask whether the intended operation is removal, sampling or pressure relief, and what recovery support is likely.
Radiation: this may be considered for selected tumours or disease that cannot be completely removed. A feline intracranial tumour radiation study reports outcomes in a mixed group; it should not be treated as a guarantee for every tumour subtype. Discuss treatment visits, anaesthesia and possible adverse effects.
Medicines: chemotherapy has a role for certain diagnoses, including some lymphomas, but is not a universal treatment for all brain masses. Antiseizure medicines and treatment of swelling may improve comfort without eliminating the tumour.
Palliative care: agree on practical goals such as comfortable rest, eating, safe mobility and seizure control. Discuss what would trigger a medication review, emergency attendance or an end-of-life conversation.
When it is an emergency
Seek emergency care for a seizure lasting five minutes, repeated seizures without full recovery, collapse, inability to stand or rapidly worsening consciousness. A first seizure still warrants prompt veterinary advice even when your cat appears normal afterwards.
Keep hands away from the mouth during a seizure, reduce nearby hazards and time the episode. Do not restrain your cat or give anything by mouth while awareness is impaired. Use rescue medicine only as previously prescribed.
Repeated seizures over a short period need immediate veterinary advice even if your cat recovers between episodes. These cluster seizures are also emergencies, as explained in the ACVIM seizure emergency consensus statement.
Common mistakes to avoid
- Assuming an older cat's new confusion is simply ageing.
- Treating all brain tumours as equally operable or equally hopeless.
- Stopping seizure medication because episodes have become less frequent.
- Believing a supplement, diet or routine vaccination prevents all brain tumours.
Monitoring and prevention
There is no reliable general prevention programme for feline brain tumours. Routine veterinary care helps identify health changes and supports treatment decisions. At home, keep a brief diary of appetite, toileting, mobility, interaction and seizures, and follow the agreed review schedule.
Frequently asked questions
Can MRI prove which tumour my cat has?
It can strongly suggest a type, but tissue may be needed for confirmation.
Does age rule out treatment?
No. Overall health, tumour location, likely benefit and treatment burden matter more than age alone.
How long will my cat live?
There is no useful single figure for all brain tumours. Ask for a range based on the likely diagnosis and proposed treatment, including the uncertainty.
A specific diagnosis and clear goals make it easier to choose a plan that protects your cat's comfort.
For support understanding test results and preparing questions for your veterinary team, contact ASK A VET™.
