Figure 5a. Unsubtracted (a) and subtracted (b) digital arteriograms obtained in an elderly man with bilateral popliteal aneurysms show the right popliteal artery (arrow in a), anterior tibial artery (arrowhead), and tibioperoneal trunk (arrow in b). The right-sided aneurysm was thrombosed, and the patient underwent embolectomy and bypass surgery.