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Atypical meningioma. a: patternless pattern (HE: original magnification, ×10). b: high cellularity and small cells with high nuclear:cytoplasmic ratio (HE: original magnification, ×10). c: prominent nucleoli and mitotic figures (HE: original magnification, ×40. d: necrosis. HE: original magnification, ×20). HE: hematoxylin and eosin.
