The retrotracheal triangle.
D001013:Aorta, Thoracic / Q000002:abnormalities; D001165:Arteriovenous Malformations / Q000000981:diagnostic imaging; D004935:Esophageal Diseases / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008478:Mediastinal Emphysema / Q000000981:diagnostic imaging; D008482:Mediastinum / Q000033:anatomy & histology*; D008875:Middle Aged; D011859:Radiography; D013899:Thoracic Neoplasms / Q000000981:diagnostic imaging; D014132:Trachea / Q000033:anatomy & histology* / Q000000981:diagnostic imaging