title: Middle mediastinal thymoma simulating pericardial cyst.
mesh_terms: D000328:Adult; D003560:Cysts / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006331:Heart Diseases / Q000175:diagnosis; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis* / Q000601:surgery; D010496:Pericardium; D013945:Thymoma / Q000175:diagnosis* / Q000601:surgery