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Pathologic findings of meningothelial meningioma. Macroscopic view at low power magnification (10X) shows meningothelial cells that are packed together in fascicles and whorls in a syncytial pattern. The nuclei are round and uniform, and occasional psammoma bodies are noted (A). Approximately 2–3% of tumor cells nuclei are immunoreactive for Ki- 67 (Immunostainx100) (B). Some of the tumor cells are immunoreactive for PR (Immunostainx100) (C).
