title: The retrosternal line. A new sign of an anterior mediastinal mass.
mesh_terms: D000328:Adult; D002648:Child; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging; D006801:Humans; D007231:Infant, Newborn; D008479:Mediastinal Neoplasms / Q000000981:diagnostic imaging*; D008482:Mediastinum / Q000033:anatomy & histology; D011859:Radiography; D013945:Thymoma / Q000000981:diagnostic imaging*