title: Naturally occurring mediastinal teratoma with malignant transformation in an adult male.
abstract: We report a rare case of rhabdomyosarcoma spontaneously arising in an anterior mediastinal teratoma in a 47-year-old male. The patient was found to have an anterior mediastinal mass on a chest X-ray, which was taken two months before his presentation to Asan Medical Center. A subsequent computed tomography scan revealed an 8.9×7.1×8.0 cm heterogeneous mass in the anterior mediastinum. He underwent an excision via median sternotomy. The histopathologic study identified a mature teratoma with embryonal rhabdomyosarcoma.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Asan Medical Center, University of Ulsan College of Medicine, Korea.
authors.forename: Ho Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: Hyeong Ryul
authors.initials: HR
authors.lastname: Kim
keywords: Mediastinal neoplasms; Rhabdomyosarcoma; Teratoma; Teratoma with malignant transformation