Pneumopyelography.
Poorly opacified calculi that are completely obscured by high-density contrast media can be delineated by pneumopyelography. Three examples of pneumopyelography are presented.
D002245:Carbon Dioxide; D006801:Humans; D011029:Pneumoradiography; D014545:Urinary Calculi / Q000000981:diagnostic imaging*; D014567:Urography / Q000379:methods*
D002245:Carbon Dioxide