title: A thymic cyst presenting as cardiomegaly.
mesh_terms: D000293:Adolescent; D006332:Cardiomegaly / Q000175:diagnosis*; D003560:Cysts / Q000175:diagnosis* / Q000209:etiology; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D013950:Thymus Gland