title: An unusual anterior mediastinal tumor.
mesh_terms: D000293:Adolescent; D001013:Aorta, Thoracic; D001014:Aortic Aneurysm / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis*