Meningioma

Dura is not evident grossly or in the sections examined. Mitoses are extremely rare in the sections of tumor, and there is no atypia.

There is no evidence of necrosis or a significant number of mitoses.

Focal tumor necrosis and rare pleomorphic nuclei. Rare mitotic figures are noted, with the Ki-67 <1%. EMA is positive.

The psammoma body formation in this meningioma is very prominent.

The EMA stain is focally positive. The Ki-67 stain shows a low proliferative rate (<1%).

This meningioma infiltrates the dura mater extensively. There is nuclear pleomorphism and rare mitotic figures. There is no necrosis.