INFRAINGUINAL ANEURYSM FORMATION IN ARTERIALIZED AUTOLOGOUS SAPHENOUS-VEIN GRAFTS

True aneurysm formation in arterialized autologous veins is an unusual complication. We studied a patient with 2 aneurysms occurring in the mid and distal portion of an in situ femoropopliteal bypass. The first aneurysm led to graft occlusion 4 years after the primary interventio n, requiring replacement of the ectatic graft segment. The graft was s till patent when the patient was examined 7 years after the primary in tervention and 3 years after the first aneurysm. In the mid portion of the graft, a true aneurysm measuring 5 by 8 cm had developed. The ane urysm was replaced by a reversed segment of the contralateral greater saphenous vein. Recovery was uneventful. Advanced atherosclerotic chan ges with extensive intimal fibroplasia, subendothelial cholesterol dep osits, and ulcerations were revealed by means of histopathology of the aneurysm wall. Atherosclerosis is considered to be the main cause of aneurysm formation in vein grafts, but a review of the literature sugg ests the additional etiopathogenic factors should be further investiga ted.