Follow-up thoracic and abdominal angiogram 14 months later: severe tapering of the subclavian arteries bilaterally, narrowing, and irregularity of distal aorta. The ascending aorta measured 2.5 cm whereas the distal thoracic aorta measured only 1.2 cm in diameter and tapered to 7.5 mm transversely at the narrowest point just beyond the aortic hiatus.