Peripheral arterial aneurysms usually present in common, specific locations. In the lower limb, this is the popliteal artery. False aneurysms occur most commonly in the groin. True femoral aneurysms are uncommon and are often associated with hypertension and aneurysms in other locations. Frequently true femoral aneurysms are a consequence of atherosclerotic changes but sometimes these can be mycotic in origin too Deep femoral artery aneurysms are relatively uncommon, probably because this artery usually remains free of arteriosclerotic changes or because the surrounding muscular tunnel protects the artery from aneurysmal dilatation. Deep femoral artery aneurysms Fig. 1. Duplex ultrasound of deep femoral artery aneurysm. are usually only recognised when they rupture.