title: Rhabdomyosarcoma and benign teratoma.
abstract: A case of mediastinal embryonal rhabdomyosarcoma occurring with a benign teratoma is reported. In all histologic sections of tumor, the two elements were distinctly separate. This is felt to represent two independently developing tumors that ultimately fused to form a "collision tumor" rather than a sarcoma arising in a benign teratoma.
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D008479:Mediastinal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D011859:Radiography; D012208:Rhabdomyosarcoma / Q000000981:diagnostic imaging / Q000473:pathology*; D013724:Teratoma / Q000000981:diagnostic imaging / Q000473:pathology*