title: Benign iatrogenic cause of mediastinal gas seen on computed tomography.
abstract: Following intravenous administration of contrast material, intravenous gas was trapped by a mediastinal mass obstructing the superior vena cava (SVC). The computed tomographic demonstration of gas in the region of a mediastinal mass producing SVC obstruction is presented.
mesh_terms: D000368:Aged; D003287:Contrast Media / Q000009:adverse effects*; D005740:Gases; D006801:Humans; D007049:Iatrogenic Disease / Q000000981:diagnostic imaging*; D007275:Injections, Intravenous / Q000009:adverse effects; D008297:Male; D008482:Mediastinum / Q000000981:diagnostic imaging*; D013577:Syndrome; D014057:Tomography, X-Ray Computed; D014683:Vena Cava, Superior / Q000000981:diagnostic imaging*
chemical_list: D003287:Contrast Media; D005740:Gases