title: Sarcomatoid carcinoma of the renal pelvis with giant cell tumor-like features: case report with immunohistochemical findings.
abstract: Sarcomatoid transitional cell carcinoma is a rare entity, in which a malignant, overtly epithelial component coexists with areas having a sarcoma-like appearance. Histological distinction of sarcomatoid carcinomas from carcinosarcomas is often difficult and immunohistochemistry is a helpful diagnostic adjunct in the correct diagnosis. In the present report, we describe an uncommon case of sarcomatoid transitional cell carcinoma of the renal pelvis, associated with giant cell tumor-like features. Immunoperoxidase staining for cytokeratin was positive in spindle cell component, indicating an epithelial origin. The carcinomatous component showed a diffuse membranous reactivity for E-cadherin, whereas the reactivity was sporadic and weaker in the sarcomatoid component, suggesting that the decrease of E-cadherin expression might be associated with the acquisition of sarcomatous morphology. Osteoclast-like multinucleated giant cells were positive for CD68 and negative for p53 oncoprotein, suggesting that they represent a non-neoplastic component that is reactively induced in the tumor stroma.
authors.affiliation: Osmangazi University Medical Faculty, Department of Pathology, Eskisehir, Turkey. acikalin@ogu.edu.tr
authors.forename: Mustafa Fuat
authors.initials: MF
authors.lastname: Acikalin
authors.forename: Sare
authors.initials: S
authors.lastname: Kabukcuoglu
authors.forename: Cavit
authors.initials: C
authors.lastname: Can
mesh_terms: D000368:Aged; D015703:Antigens, CD / Q000378:metabolism; D015214:Antigens, Differentiation, Myelomonocytic / Q000378:metabolism; D015820:Cadherins / Q000378:metabolism; D002295:Carcinoma, Transitional Cell / Q000378:metabolism / Q000473:pathology*; D002296:Carcinosarcoma / Q000378:metabolism / Q000473:pathology*; D015726:Giant Cells / Q000378:metabolism / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D007680:Kidney Neoplasms / Q000378:metabolism / Q000473:pathology*; D007682:Kidney Pelvis / Q000473:pathology; D008297:Male; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D000097382:CD68 Molecule
chemical_list: D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D015820:Cadherins; D016159:Tumor Suppressor Protein p53; C067980:CD68 antigen, human; D000097382:CD68 Molecule