Azygography.
D001401:Azygos Vein; D004938:Esophageal Neoplasms / Q000175:diagnosis; D006333:Heart Failure / Q000175:diagnosis; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis; D008480:Mediastinitis / Q000175:diagnosis; D008946:Mitral Valve Stenosis / Q000175:diagnosis; D010690:Phlebography