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Washington University Experience | NEOPLASMS (MENINGIOMA) | Brain Invasion | 5C1 Meningioma, atypical, brain invasion (Case 5) GFAP 5
5C1,2 GFAP immunostaining reveals thin extensions of neuropil ramifying extensively between and around 'fingers' of tumor tissue. The tumor meets WHO histological and mitotic index criteria for the diagnosis: atypical meningioma, WHO Grade 2 with brain invasion.
