First, the groin is injected with an area anesthetic which numbs the area, then a catheter is placed into an artery from the groin and directed in the aorta. Contrast dye is injected to the aorta, aneurysm, and blood vessels branching off with the aorta, which gives the vascular surgeon https://www.sgvascularctr.com/abdominal-aortic-aneurysm-treatment-in-singapore-a-comprehensive-guide/