[Abdominal aortic surgery in Stanford type B chronic dissecting aortic aneurysm].

Three cases of a chronic type B dissecting aneurysm which required abdominal aortic reconstruction are presented. Constriction of the iliac artery due to dissection was found in case 1, in case 2 the left subclavian artery originated from a giant false lumen, and arteriosclerosis obliterans was observed in case 3. The left renal artery originated from a false lumen in all cases. Each patient underwent preliminary graft replacement of the abdominal aorta because using the femoral artery for extracorporeal circulation had a higher risk factor. The distal arch and descending aorta were then replaced with woven dacron graft. In a chronic type B dissecting aneurysm, the surgical procedure is sometimes complex because of the narrowing of the true lumen and the enlargement of the false lumen or arteries originating from the false lumen to major organs. It is necessary to consider preliminary abdominal reconstruction in cases of 1) dilatation of abdominal aneurysm, 2) obstruction, stenosis or thrombus below the abdominal aorta, or 3) presence of a giant false lumen.