MICROSCOPIC DESCRIPTION: The sections show an unremarkable nerve fasciculus which terminates in a circumscribed lesion which consists of viable bone with prominent thin-walled ectatic blood vessels within intertrabecular spaces. These are lined by unremarkable endothelium. Stromal connective tissue is unremarkable. The features are of cavernous haemangioma. No evidence of malignancy is seen.
DIAGNOSIS: Left facial nerve tumour: Intraosseous cavernous haemangioma.