Close
MICROSCOPIC DESCRIPTION: The sections show a moderately hypercellular tumour. This consists of epithelioid and spindle cells which are heavily laden with globular brown pigment and show strong immunostaining for the melanocyte markers, tyrosinase and melan A. Tumour cells show moderate nuclear pleomophism with vesicular nuclei containing conspicuous nucleoli. No mitotic figures are identified and the topoisomerase index is <1%. A small focus of coagulative necrosis is also noted. Focal dural attachment is identified in one tumour fragment.
DIAGNOSIS: Melanocytic tumour with features favouring meningeal melanocytoma.