An unusual case of abdominal arteriovenous fistula.

Arteriovenous fistula between major abdominal vessels is an uncommon occurrence. It most frequently occurs between the aorta and the inferior vena cava; however, when occurring between the other arteries and veins, it is much rarer and has usually been secondary to surgical trauma or penetrating wounds. This is the report of an unusual case of an arteriovenous fistula, secondary to erosion of an atherosclerotic left iliac artery aneurysm into the left iliac vein.