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