title: Retrograde pyelography with gas (carbon dioxide) as contrast medium.
mesh_terms: D000368:Aged; D002245:Carbon Dioxide; D003287:Contrast Media; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014567:Urography
chemical_list: D003287:Contrast Media; D002245:Carbon Dioxide