disease has location malignant teratoma mediastinum teratoma extragonadal nonseminomatous germ cell tumor mediastinal malignant germ cell tumor malignant teratoma of mediastinum MEDGEN:91164 immature malignant teratoma of mediastinum NCIT:C4668 UMLS:C0349663 mediastinal immature malignant teratoma SCTID:278042005 immature malignant teratoma of the mediastinum MONDO:0021283 malignant teratoma of the mediastinum A malignant teratoma that involves the mediastinum. GARD:0025306 mediastinum malignant teratoma malignant mediastinal teratoma mediastinum