Mediastinal thymic cyst.
D000293:Adolescent; D000328:Adult; D003560:Cysts; D005260:Female; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008875:Middle Aged; D011859:Radiography; D013953:Thymus Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery