The transverse colon retracted superiorly.  The small bowel was wrapped in moist green towel and retracted in the right upper quadrant.  The posterior peritoneum overlying the aneurysm was scribed mobilizing the ligament of Treitz thoroughly ligating and dividing the inferior mesenteric vein.  Dissection continued superiorly to identify the left renal vein and the right and left inferior renal arteries.  The mid left renal artery was likewise identified.  The perirenal aorta was prepared for clamp superior to the inferior left renal artery.  During this portion of the dissection, the patient was given multiple small doses of intravenous mannitol to establish an osmotic diuresis.  The distal dissection was then completed exposing each common iliac artery.  The arteries were suitable for control.