Figure 1c. Endovascular procedure. (a) Image from digital subtraction angiography (DSA) shows a saccular aneurysm of the descending thoracic aorta. (b) DSA image shows the delivery system positioned at the desired location. The outer sheath is withdrawn for deployment of the stent-graft. (c) DSA image obtained after deployment shows correct positioning of the stent-graft in the descending aorta. (d) Postprocedure DSA image shows complete exclusion of the aneurysmal sac.