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Meningeal mass in a 40‐year‐old woman with slight headache

Paraffin sections of the specimens showed a moderately cellular tumor composed of short fascicles of spindleshaped cells. The nuclei were uniform and contained distinct nucleoli. Mitotic figures were occasionally found, and the highest count over 10 consecutive high-power fields was 4 (Fig. 2a). In many areas the neoplasm had the typical features of a meningothelial meningioma with distinct whorl formation. There were scattered foci of micronecrosis (Fig. 2b). Tumor cells were strongly positive for immunoperoxidase stain for vimentin and epithelial membrane antigen. Focal positivity for S-100 protein was also found, but immunostaining for GFAP was entirely negative throughout. MIB-1 stain for Ki-67 antigen was positive in 8.6% of tumor cell nuclei (Fig. 2c).