Fig. 3.

Hematoxylin and eosin stain sections of the 3 main subtypes of meningiomas developed on cyproterone acetate (CPA): (A) meningothelial, characterized by sheets, whorls or syncytia of neoplastic cells which have round or oval centrally located nuclei and dispersed chromatin, smooth nuclear profiles and small indistinct nucleoli. (B) Transitional defined by mixed histology, typically containing meningothelial, and fibrous components and (C) microcystic with extracellular spaces, scattered throughout the meningioma substrate. (Scale length: 100 µm).