title: Squamous cell carcinoma with sarcomatous feature (so-called carcinosarcoma) of stomach probably metastasized from esophageal tumor: a case report with quick-freezing and deep-etching method.
abstract: A squamous cell carcinoma (SCC) with sarcomatous features (so-called carcinosarcoma) of stomach is reported in a 72-year-old man. The gastric submucosal tumor (12 x 11 x 6 cm) consisted of carcinoma cells and sarcomatous spindle cells, which were immunohistochemically recognized to contain high molecular weight cytokeratin. These histological and immunohistochemical results indicated that carcinoma cells and spindle tumor cells had cytokeratin similar to that of stratified squamous epithelium. These features were consistent with so-called carcinosarcoma of esophagus. A combined type of tumor consisting of polypoid and shallow ulcerative lesions (5.5 cm in diameter) was demonstrated by the biopsy to have SCC on the polypoid surface area. Therefore, the gastric tumor was thought to have metastasized from the esophageal tumor. The quick-freezing and deep-etching (QF-DE) method demonstrated that many spindle tumor cells in the gastric tumor had abundant intermediate filaments, which were evenly distributed in more peripheral cytoplasm along the cell membrane. This feature was similar to that of the control SCC. Intramembranous protein particles in the cell membrane of the tumor cells were markedly decreased as compared with those of control SCC. These ultrastructures by QF-DE method could be used for the pathological diagnosis of so-called carcinosarcomas of esophagus.
authors.affiliation: Department of Pathology, Nihon University Nerima Hikarigaoka Hospital, 2-11-1 Hikarigaoka, Nerima, Tokyo 179-0072, Japan. ahemmi@med.nihon-u.ac.jp
authors.forename: Akihiro
authors.initials: A
authors.lastname: Hemmi
authors.forename: Nobuo
authors.initials: N
authors.lastname: Terada
authors.forename: Gou
authors.initials: G
authors.lastname: Mizutani
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Fujii
authors.forename: Shinichi
authors.initials: S
authors.lastname: Ohno
authors.forename: Norimichi
authors.initials: N
authors.lastname: Nemoto
mesh_terms: D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000556:secondary / Q000648:ultrastructure*; D002296:Carcinosarcoma / Q000378:metabolism / Q000473:pathology* / Q000648:ultrastructure; D004938:Esophageal Neoplasms / Q000378:metabolism / Q000473:pathology* / Q000648:ultrastructure; D005613:Freeze Etching / Q000379:methods; D006801:Humans; D007633:Keratins / Q000378:metabolism*; D008297:Male; D008854:Microscopy, Electron; D013274:Stomach Neoplasms / Q000378:metabolism / Q000556:secondary / Q000648:ultrastructure*
chemical_list: D007633:Keratins