[Arteriovenous and arterial-digestive system fistulas complicating isolated iliac aneurysm].

Isolated iliac aneurysms are often discovered when they rupture, sometimes into a neighbouring organ. We report 2 cases of aneurysm of the common iliac artery, one which ruptured into the right common iliac vein and the other in to the sigmoid. Diagnosis was made at laparotomy in the first case and on the CT-scan of the pelvis in the second. The first case was treated with an exclusion graft using ilio-iliac bypass with suture of the venous breach via the aneurysm. In the second case, the aneurysm was excluded by ligature of the iliac arteries with extra-anatomic crossed femoro-femoral bypass, sigmoid colostomy and drainage of the pelvis. These two cases illustrate the importance of digital examination of the pelvis and CT-scan for the diagnosis of complicated aneurysms of the iliac vessels. Rapid surgery is a determining factor in prognosis.