The aorta distal to the origin of the left subclavian artery is elongated and redundant with buckling and apparent luminal narrowing at the left of the ligamentum arteriosum. The descending segment of the aorta distal to the buckled segment is dilated. The descending aorta measures 3.7 cm in maximum diameter. There is no dissection, collateral circulation, or contrast extravasation. The dilated descending segment of the aorta indents the left pulmonary artery and obliterates the aortopulmonary window posterior to the ligamentum arteriosum.