title: Carcinosarcoma of the oesophagus with rhabdomyoblastic differentiation.
abstract: We report a case of oesophageal carcinosarcoma with prominent rhabdomyoblastic differentiation. Immunohistochemically, the rhabdomyblasts were mainly reactive to vimentin, cytokeratin, desmin, muscle-specific actin, myosin, and myoglobin, and were surrounded by laminin and type IV collagen-positive basement membranes. The tumour had dual differentiation, carcinomatous and sarcomatous, but also showed evident features of transition between the two components; suggesting a common origin. An epithelial-mesenchymal conversion could be the pathogenetic mechanism involved in the histogenesis of this lesion. The word carcinosarcoma, from a descriptive point of view, seems the most suitable to describe a tumour composed of both carcinomatous and true sarcomatous elements.
authors.affiliation: Department of Anatomical Pathology, Hospital of Treviglio, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Guarino
authors.forename: D
authors.initials: D
authors.lastname: Reale
authors.forename: G
authors.initials: G
authors.lastname: Micoli
authors.forename: B
authors.initials: B
authors.lastname: Forloni
mesh_terms: D000368:Aged; D002296:Carcinosarcoma / Q000473:pathology*; D004938:Esophageal Neoplasms / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D012208:Rhabdomyosarcoma / Q000473:pathology*