“…The remaining locations (24%) are in the mediastinum, the retroperitoneum and other midline structures [5][6][7]. Teratomas arising within the chest have been described to be located in the anterior or posterior mediastinum in the vicinity of the aorta, esophagus, pericardium, lung and diaphragm [5,7,8]. Other tumor entities such as manifestations of lymphomas, neuroblastomas, sarcomas or other kinds of small round blue cell tumors and metastases have to be excluded, as well as nonmalignant causes which mimicry a tumor as an infectious manifestation.…”