Descending aorta saccular aneurysms are seen less than fusiform aneurysms. All symptomatic saccular aneurysms must be operated. In this study, we present a saccular aneurysm case developed at the descending aorta 1 year after a motor vehicle crash. Following an aorta-LAD saphenous vein graft anastomosis performed in beating heart, the aneurysm neck was closed with a Dacron patch under deep hypothermic circulatory arrest. All signs and symptoms removed dramatically after the operation. Regarding this case, we recommend that the surgical treatment must be performed in accordance with localization and specialties of aortic aneurysms.