title: [Diagnostic significance of retrograde venography of the azygos vein in esophageal neoplasms].
mesh_terms: D001401:Azygos Vein / Q000000981:diagnostic imaging*; D004938:Esophageal Neoplasms / Q000000981:diagnostic imaging*; D004947:Esophagus / Q000000981:diagnostic imaging; D006801:Humans; D008722:Methods; D011859:Radiography