title: Myoepithelioma of the retroperitoneum.
abstract: An abdominal mass detected in a 36-year-old man was thought from radiologic studies to be a renal neoplasm, but at surgery the kidney was found to be uninvolved. The 9.5-cm retroperitoneal tumor was resected totally and found to be encapsulated, and it appeared to be benign by light microscopy. The pattern of the spindle cells throughout the tumor suggested a cellular schwannoma, but immunocytochemical and ultrastructural studies did not support schwannian differentiation and instead revealed epithelial and smooth muscle features compatible with a myoepithelioma.
authors.affiliation: Department of Pathology, University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
authors.forename: T
authors.initials: T
authors.lastname: Burke
authors.forename: A
authors.initials: A
authors.lastname: Sahin
authors.forename: D E
authors.initials: DE
authors.lastname: Johnson
authors.forename: N G
authors.initials: NG
authors.lastname: Ordóñez
authors.forename: B
authors.initials: B
authors.lastname: Mackay
mesh_terms: D000199:Actins / Q000032:analysis; D000328:Adult; D006801:Humans; D007633:Keratins / Q000032:analysis; D008297:Male; D009208:Myoepithelioma / Q000737:chemistry / Q000473:pathology / Q000648:ultrastructure*; D012186:Retroperitoneal Neoplasms / Q000737:chemistry* / Q000473:pathology / Q000648:ultrastructure; D014057:Tomography, X-Ray Computed
chemical_list: D000199:Actins; D007633:Keratins