title: Letter: Asymptomatic superior vena cava obstruction.
mesh_terms: D000368:Aged; D003102:Colloids; D005260:Female; D006801:Humans; D008099:Liver; D011877:Radionuclide Imaging; D013455:Sulfur; D013667:Technetium; D013927:Thrombosis / Q000175:diagnosis*; D014683:Vena Cava, Superior
chemical_list: D003102:Colloids; D013455:Sulfur; D013667:Technetium