Microscopically, it shows no brain tissue but tumor tissue composed of proliferation of meningothelial-like cells in patternless sheet and focal whorl patterns with increased mitotic activity. Mitotic count is 5~10 mitoses per 10 HPF. The tumor cells reveal enlarged round to oval nuclei, distinct nucleoli, and mildly nuclear pleomorphism. Focal calcification and hemorrhage are noted, but no obvious necrosis is found. Immunohistochemical stains are positive for EMA and Vimentin, negative for CK and GFAP. Ki-67 proliferation index is around 10%. According to these features, an atypical meningioma (WHO grade 2) is suspected. Please correlate with clinical findings.