Cerebellar cystic meningioma in a dog

A 21-kg, seven-year-old, male, mixed-breed Labrador retriever was admitted for incoordination and a head tilt of approximately three months' duration. Ataxia was noted of the trunk and limbs, and there was a head tilt to the right side. Conscious proprioceptive deficits were present in the left thor acic and pelvic limbs (i.e., hemiparesis). These abnormalities were consist ent with paradoxical vestibular syndrome and a lesion involving the caudal cerebellar peduncle. A mass lesion consisting primarily of fluid was presen t on magnetic resonance imaging and at craniectomy. Histopathological diagn osis was a cystic meningioma. Based upon previous reports and experience, t he location of this tumor was unusual.