[Debakey IIIb aortic dissection from a distal arch atherosclerotic aneurysm--a case report].

We treated a 75-year-old male patient with DeBakey IIIb aortic dissection from a distal arch atherosclerotic aneurysm 75 mm in diameter. Arch replacement was carried out by separate extracorporeal circulation. The entry located juxta-atherosclerotic aneurysm. It was considered that shear stress at the turning point of blood flow would occur the dissection. The relationship between the atherosclerotic aneurysm and the aortic dissection was studied.