Case summary A 13-year-old castrated male American Shorthair cat was referred for evaluation following a 3-week history of poor balance and decreased activity. The MRI findings revealed a well-defined left caudal cerebellar mass with a diameter of 1.2 cm, consistent with a meningioma. CT and MRI scans did not reveal metastasis. After a suboccipital craniotomy, the mass was resected subtotally as a result of parenchymal invasion. A histopathological examination revealed a benign fibrous meningioma with invasion into the cerebellum at the tumour margins. Postoperatively, the cat remained asymptomatic for 25 months, but ataxia recurred, and tumour recurrence was confirmed using MRI and post-mortem examination. Relevance and novel information This case demonstrates that even feline meningiomas with benign features can exhibit brain invasion. Since brain invasion is an indicator of malignancy in meningioma, a detailed histopathological evaluation of the tumour margins is essential for accurate grading and prognosis.

Kiyotaka Arai

Shinichi Nakamura

Kanami Matsubara

Yuma Ozaki

Sho Kadekaru

Akihiko Sugiyama

Ikki Mitsui

Natsuki Akashi

Ryohei Yoshitake

Kenji Kutara

Journal of Feline Medicine and Surgery Open Reports

Brain invasion by an otherwise benign meningioma in a cat

猫脑内良性脑膜瘤的侵袭

Brain invasion by an otherwise benign meningioma in a cat

ivySCI AI Smartly Parses PDF, Answers Researchers' Questions, and Helps You Understand Papers in Seconds

Journal Info

Category	Quartile
VETERINARY SCIENCES	3