title: Oncocytic meningioma.
abstract: Six cases of meningioma showing oncocytic changes are described. The lesions were composed mostly of sheets, nests, and cords of large polygonal cells with finely granular eosinophilic cytoplasm rich in mitochondria. Neoplastic cells showed nuclear pleomorphism with prominent nucleoli. Necrosis and high mitotic rate were present in the majority of cases. Oncocytic differentiation was demonstrated by conventional histology, immunocytochemistry, electron microscopy, and Western-blot analysis. Oncocytic meningiomas showed an aggressive behavior; recurrences were observed in three cases, and invasion of brain cortex was evident in other two cases.
authors.affiliation: Department of Clinical Radiology and Anatomic Pathology, University of Bologna, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Roncaroli
authors.forename: L
authors.initials: L
authors.lastname: Riccioni
authors.forename: M
authors.initials: M
authors.lastname: Cerati
authors.forename: C
authors.initials: C
authors.lastname: Capella
authors.forename: F
authors.initials: F
authors.lastname: Calbucci
authors.forename: C
authors.initials: C
authors.lastname: Trevisan
authors.forename: V
authors.initials: V
authors.lastname: Eusebi
mesh_terms: D018249:Adenoma, Oxyphilic / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D000368:Aged; D015153:Blotting, Western; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007680:Kidney Neoplasms / Q000473:pathology; D008297:Male; D008577:Meningeal Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D008579:Meningioma / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D008875:Middle Aged; D012189:Retrospective Studies; D012468:Salivary Gland Neoplasms / Q000473:pathology