title: Stromal osseous metaplasia in carcinoma of the bladder.
abstract: Osseous metaplasia of the stroma of carcinomas of the bladder is a rare finding that must be distinguished from osteosarcoma and carcinosarcoma. We report a case of multifocal osseous metaplasia in a high grade urothelial carcinoma with extensive glandular differentiation, arising in the base of the bladder of an 84-year-old man. Reports of 11 other cases of stromal osseous metaplasia in primary bladder carcinomas and of 5 cases of stromal osseous metaplasia in metastases of bladder carcinoma are reviewed.
authors.affiliation: Department of Pathology, Indiana University School of Medicine, Indianapolis.
authors.forename: J N
authors.initials: JN
authors.lastname: Eble
authors.forename: R H
authors.initials: RH
authors.lastname: Young
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002295:Carcinoma, Transitional Cell / Q000473:pathology*; D006801:Humans; D008297:Male; D008679:Metaplasia; D009999:Ossification, Heterotopic / Q000473:pathology; D001749:Urinary Bladder Neoplasms / Q000473:pathology*