title: Non-dilated superior vena cava presenting as a superior mediastinal mass.
mesh_terms: D000783:Aneurysm / Q000000981:diagnostic imaging; D001013:Aorta, Thoracic / Q000000981:diagnostic imaging; D001401:Azygos Vein / Q000000981:diagnostic imaging; D001995:Bronchography; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008477:Mediastinal Diseases / Q000000981:diagnostic imaging*; D008875:Middle Aged; D014132:Trachea / Q000000981:diagnostic imaging; D014683:Vena Cava, Superior