Operations for extensive aortic aneurysm are generally performed as staged operations with or without elephant trunk technique. However, we must consider single stage replacement in cases that are unsuitable for elephant trunk technique. We report a case of successful sing1e stage replacement of the entire thoracic aorta from the aortic valve to the level of diaphragm. The patient was a 35-year-old male who had Marfanoid features and had previously undergone replacement of the ascending aorta for aortic dissection. He recovered without neurologic complication and was discharged on 29th day after the operation. .