In this study, the brain tumor was visualized via MRI in 98 percent of the cats reported. MRI features of intracranial tumors
predicted the histopathologic diagnosis in 82 percent of the cases. Individual accuracy rate for each tumor type varied widely,
from 0 for olfactory neuro- blastoma to 96 percent for meningioma. A high frequency of meningioma in the feline population
was mentioned in another recent paper by Troxel and co-workers in 2003 [Feline Intracranial Neoplasia: Retrospective Review of 160 Cases (1985-2001]. J Vet Intern Med 2003; 17:850-859). Meningioma was the most common tumor type identified in 58.1 percent of cats with brain tumors. Multiple meningiomas were
seen in 17.2 percent of cats affected with intracranial tumors. In fact, meningioma is the most-common extra-axial tumor in
cats, and the odds are high that an extra-axial mass in a cat is a meningioma. Improved knowledge of feline brain tumors is
required for accurate ante- mortem diagnosis. MRI appears to be extremely valuable in predicting tumor type before surgical
treatment, biopsy, radiation therapy, chemotherapy or a combination of these measures can be appropriately employed.
Editor’s Note: Comments and questions can be directed to Pierre S. Bichsel, DVM, or Ronald Lyman, DVM at the Animal Emergency and Referral
Center, 3984 S. US Highway 1, Ft. Pierce, Fla., 34982; (772) 466-0460.