Pathology: ectopic meningioma

Ectopic meningioma, microcystic

• Hypocellular, with infiltration of bone trabeculae

• Loose fascicles of spindle-stellate cells with eosinophilic cytoplasm

• Ovoid monomorphic nuclei; inconspicuous mitotic activity

• Variable intervening collagen

• IHC: epithelial membrane antigen

• PMID: 25517950