tortuous calcified aortatortuous descending thoracic aortatortuous ectatic thoracic aortamildly tortuous thoracic aortatortuosity of the thoracic aortatortuous descending aortamild tortuosity of the thoracic aortathoracic aorta atherosclerosistortuous thoracic aortaarteriosclerosis of the aortaatherosclerosis of abdominal aortaascending aorta surgery