[A Rare Diagnosis for a Patient with Shoulder Pain - Mature Teratoma of the Mediastinum].

Introduction: Thanks to a conscientious work-up in the general practitioner's office and referral to goal-directed diagnostics, the benign thoracic tumor could be submitted to curative resection. Although the radiological and laboratory examinations made the benign entity of a mature teratoma in a young, postpubertal male highly probable, the clinic is usually nonspecific and makes classification difficult, so that a histo-pathological work-up and resection were mandatory in this case in order to obtain diagnostic certainty about the dignity and to allow for timely therapy according to the guidelines.