Suprarenal region of the abdominal aorta is the portion from the last intercostal artery to the right renal artery.In the Angiotensin II infused mouse model, abdominal aortic aneurysms are located in this region. Maximal outer width of the suprarenal aorta is a major parameter to define abdominal aortic aneurysms. Fifty % or more increase of this parameter, compared to control (saline infusion), is defined as an abdominal aortic aneurysm.