[A case of DeBakey type IIIb acute aortic dissection extending through an atherosclerotic abdominal aortic aneurysm].

We report a case of DeBakey type IIIb aortic dissection which extended distally through a pre-existing fusiform abdominal aortic aneurysm. The concurrence of aortic dissection and atherosclerotic aortic aneurysm is unusual. Among the various types of this concurrence, aortic dissection extending through a pre-existing aneurysm is rare.