Ten patients underwent operation for aortic aneurysms from Jan. 1983 to April 1988 at the Department of Thoracic and Cardiovascular Surgery, Keimyung University Hospital. There were 7 males and 3 females in this series. The age ranged from 16 to 70 years with the mean age of 45 years. The cause of the aneurysm was atherosclerosis in 8 patients, mycosis in 1 patient and unknown in 1 patient. There were two patients with ascending aortic aneurysm treated by Dacron graft replacement, with no hospital death. One patient with aortic arch aneurysm was received Dacron graft replacement under cardiopulmonary bypass and died on the 21st postoperative day because of cerebral edema. There were three patients with descending aortic aneurysm. The aneurysm in two patients was successfully repaired by Dacron graft. One additional patient with ruptured aneurysm died at operation because of ventricular fibrillation. Four patients with abdominal aortic aneurysm were underwent Dacron graft replacement and the results were good.