The abdominal aneurysm extends down to the common iliac arteries in about 25%-30% of patients. In such cases, the iliac limbs can be extended into the external iliac artery to bypass a common iliac aneurysm. Alternatively, a specially designed endograft, (an iliac branch device) can be used to preserve flow to the internal iliac arteries. The preservation of the hypogastric (internal iliac) arteries is important to prevent buttock claudication and impotence, and every effort should be made to preserve flow to at least one hypogastric artery.