Abstract
The renewed interest in the adrenal, pancreas, and other retroperitoneal structures stands as a challenge to better diagnostic methods. The outline of the retroperitoneal space has been attempted with small quantities of air or oxygen. 1,2,5,9 However, air embolism following the presacral or flank injection of air or oxygen is being reported with increasing frequency. 3,4,6,8 Use of CO 2 as the agent for retroperitoneal insufflation would have the following advantages: (1) The high solubility of CO 2 would reduce the hazard of gas embolization; (2) CO 2 is free of allergic or idiosyncratic properties, and (3) CO 2 is readily available and is inexpensive. Stauffer, Durant, and Oppenheimer 7 have safely used CO 2 for delineation of the cardiac chambers in doses of 7.5 cc/kg. In the past six months we have been interested in the investigation of CO 2 as a medium for outlining the retroperitoneal, intraperitoneal, intravascular,
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