[Two cases of traumatic aneurysm of the aortic isthmus].

Two cases with blunt traumatic aneurysm of the aortic isthmus were treated recently. One was operated in early stage using heparin-bounded transient aorto-aorta bypass. The other underwent delayed operation with aorto-aorta bypass using centrifugal pump. Patch closures with Dacron fabric sealed by equine pericardium were performed in both of them with satisfactory results. We discussed the controversial problems, the timing of the operation and the method of adjunct circulation.