An abdominal aortic aneurysm (AAA) occurs when the walls of the main blood vessel that carries blood away from the heart (the aorta) are bulging or dilated. It is located in the abdominal area. Aneurysms can also occur in other areas of the aorta, but the abdomen is the most common site. AAA can be repaired either through “open surgery” or with the use of an “endovascular stent graft" (Endovascular aneurysm repair = EVAR) EVAR is a minimally invasive surgery to repair an aneurysm. It is performed through a small hole in the groin, rather than the large incision across the abdomen used in traditional surgery. Usually, it is performed in a hybrid theatre under X-ray guidance with the option to convert to open surgery if needed. EVAR is less invasive than open surgery and is now the preferred method to repair an AAA.