While brain tumors in cats remain fairly uncommon, it is an issue that occurs, and that can sometimes be treated effectively. A tumor is defined as an abnormal growth of cells, and may be classified as primary or secondary. A primary brain tumor originates from cells normally found within the brain and its membranes. A secondary brain tumor, on the other hand, is one that has metastasized to the brain from a primary tumor elsewhere in the body, or that is affecting the brain by extending into brain tissue from an adjacent non-nervous system tissue, such as bone. A tumor may be either malignant (cancerous), or benign.
No specific breed of cat seems to be particularly susceptible to brain tumors, although older male cats appear to be the most likely to develop benign tumors originating from the membranes covering the brain (meningiomas).
Symptoms and Types
The most common indication of a brain tumor in cats is seizures, especially seizures that begin to occur after the cat has reached at least five years of age. There are other signs which may suggest a brain tumor, including abnormal behavior and mental status, changes in habits or learned behaviors, head pressing, over-sensitivity to pain or to being touched in the neck area, bumping into objects and doorways, and vision problems that lead to circling motions, uncoordinated movement and ataxia (drunken gait). Cats may also vocalize, or meow, more, and may not purr as frequently.
The causes and risk factors that may cause brain tumors in cats are unknown. It is speculated that various dietary, environmental, genetic, chemical, and immune system factors may be involved, but this is uncertain.
Your veterinarian will perform a thorough physical exam on your pet, taking into account the background history of symptoms and possible incidents that might have precipitated this condition. Injury or trauma to the head can cause an accumulation of fluid in the skull, mimicking a tumor in outward appearance and effect. You will need to provide a thorough history of your pet's health leading up to the onset of symptoms. A tissue biopsy is the only definitive method for diagnosing brain tumors in cats. In addition, magnetic resonance imaging (MRI) scans can reveal tissue irregularities in the brain, while X-Ray and ultrasound imaging can be used to locate or rule out primary tumors in other areas of the body.