What is the primary indication for performing a femorofemoral bypass?

The primary indication for performing a femorofemoral bypass is indeed the occlusion of the iliac artery. This surgical procedure is designed to restore blood flow to the affected leg when there's a blockage or occlusion that limits perfusion due to conditions such as atherosclerosis. In cases of ileofemoral artery disease, the bypass allows for collateral circulation, ensuring adequate blood supply to the distal extremity, which is critical for preventing complications like ischemic rest pain or ulceration.

Severe claudication is associated with intermittent limb pain due to insufficient blood flow, but it is not the direct indication for a femorofemoral bypass, as this condition is often managed non-operatively or with other interventions aimed at peripheral arterial disease. Deep vein thrombosis involves a clot formation in the veins and does not require a bypass procedure; it is typically treated with anticoagulation and other methods. Varicose veins are a condition related to vein structure and function rather than a clear insufficiency of arterial blood flow, thus not suitable for femorofemoral bypass as a treatment.