MICROSCOPIC DESCRIPTION: Paraffin sections show a variably hypercellular meningioma with a dural attachment. The tumour has a well developed syncytial architecture. Calcified Psammoma bodies are also noted. Tumour cells show mild nuclear pleomorphism. An occasional mitotic figure is identified (1/20HPF). No areas of necrosis are seen. A single focus of invasion of tumour into white matter is identified.
DIAGNOSIS: Meningioma with focal brain invasion (WHO Grade II)