Aneurysms/lesions can be located in any position along the length of the aorta. This study evaluates only aneurysms/lesions that occur in the descending part of the thoracic aorta as it traverses the chest and enters the abdominal cavity. The risk of thoracic aneurysms/lesions is that they rupture without warning. The risk of rupture increases as the aneurysm size increases. Following rupture, almost all patients expire within the first 24 hours. For this reason treatment of thoracic aneurysms/lesions is recommended by conventional surgical means if the patient is a candidate for an operation. The conventional operation involves occluding the aorta and replacing the aneurysm with a cloth tube that is sewn to replace the diseased part of the aorta. The major surgery and occlusion of the aorta that is part of the conventional surgery is directly related to several complications that have been reported in the literature. In addition, many patients are too ill for conventional surgery due to concomitant illnesses.