title: Benign mediastinal teratoma associated with Klinefelter's syndrome.
abstract: We treated a patient with a benign mediastinal teratoma associated with Klinefelter's syndrome which was first thought to be a malignant germ cell tumor because of an anterior mass shadow, gynecomastia, atrophic testis and a high level of HCG. Chromosomal analysis showed a total of 47 XXY. Median sternotomy revealed a tumor originating from the right lobe of thymus. The postoperative course and 2 year follow-up have been uneventful.
mesh_terms: D000328:Adult; D006801:Humans; D007713:Klinefelter Syndrome / Q000150:complications* / Q000235:genetics; D008297:Male; D008479:Mediastinal Neoplasms / Q000150:complications* / Q000473:pathology; D013724:Teratoma / Q000150:complications* / Q000473:pathology