The patient was a 76-year-old woman with an atypical descending thoracic aortic aneurysm due to a highly tortuous descending aorta. The surgical approach in this case required special consideration because of the aneurysm's location. The main body of the aneurysm was in the right thoracic cavity. Descending thoracic aorta replacement with a prosthetic graft and aneurysmal total exclusion were performed through a left curvilinear thoracoabdominal incision. The patient's postoperative course was uneventful. Surgical exclusion of a thoracic aortic aneurysm may be a useful technique in this special situation. Postoperative follow-up is needed to prevent early and late complications.