MICROSCOPIC DESCRIPTION: The sections show a moderately cellular schwannoma with adjacent bone. It mainly contains Antoni A areas with fascicles of spindle cells. Occasional Verocay bodies are noted. The tumour cells show no significant nuclear pleomorphism. Mitoses are inconspicuous. There is no evidence of necrosis. Sheets of foamy macrophages and some lymphocytes are seen in the background. No evidence of malignancy is identified.
DIAGNOSIS: Right acoustic nerve lesion: Schwannoma.