mild ectasia of the thoracic aortaectatic ascending aortaectatic descending aortaectatic descending thoracic aortatortuous ectatic thoracic aortathoracic aortic atherosclerosisarteriosclerosis of the aortaaortic thrombusbest aortic surgeonsatherosclerosis of abdominal aortaabdominal aortic atherosclerosisassessment of aortic stenosis