title: Positional vertigo with cerebellar astrocytoma.
abstract: The authors present two surgically verified cases of cerebellar astrocytoma extending into the fourth ventricular floor. Each patient presented with positional vertigo, and electronystagmography revealed positional nystagmus indicative of a central lesion. The findings in these cases emphasize the need of looking for positional nystagmus in patients with suspected posterior fossa lesions.
mesh_terms: D000293:Adolescent; D001254:Astrocytoma / Q000150:complications* / Q000175:diagnosis; D002528:Cerebellar Neoplasms / Q000150:complications* / Q000175:diagnosis; D004584:Electronystagmography; D005260:Female; D006801:Humans; D009759:Nystagmus, Pathologic / Q000209:etiology; D014717:Vertigo / Q000209:etiology*