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Washington University Experience | NEOPLASMS (MENINGIOMA) | Chordoid | 3C Meningioma, Chordoid (Case 3) PR

Tumor cells show diffuse, strong nuclear reactivity for progesterone receptors. ---- Ancillary data (not shown): A MIB-1 immunostain shows a proliferative fraction of ~1% with no clusters of proliferating cells ("hot spots"). ---- These light microscopic and immunohistochemical features are those of a chordoid meningioma, WHO grade 2

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