title: Mediastinal teratoma masquerading as idiopathic enlargement of the right atrium.
abstract: A chest roentgenogram of an asymptomatic 22-year-old man revealed prominence of the right heart border characteristic of idiopathic dilatation of the right atrium. On further evaluation, a malignant teratoma was found. The importance of including teratoma and idiopathic enlargement of the right atrium in the differential diagnosis of abnormalities of the right heart border is discussed.
mesh_terms: D000328:Adult; D002312:Cardiomyopathy, Hypertrophic / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D011662:Pulmonary Subvalvular Stenosis / Q000000981:diagnostic imaging*; D011859:Radiography; D013724:Teratoma / Q000000981:diagnostic imaging* / Q000601:surgery