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atypical meningioma
Pathology:
- tendency to recur;
- corresponds histologically to grade II
Microscopic pathology:
- meningioma with increased mitotic activity (4 or more/10 HPF) or three or more of following features:
- increased cellularity
- small cells with high nuclear cytoplasmic ratios
- prominent nucleoli
- uninterrupted patternless or sheetlike growth
- foci of spontateous or geographic necrosis
Genetics: see meningeal neoplasm
General
meningioma
References
- WHO Classification Tumours of the Nervous System.
Kleihues & Cavenee eds. IARC Press 2000
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