Below the kidneys. An infrarenal aortic aneurysm is a dilation of the aorta below the renal (kidney) arteries. This section of the aorta is located in the abdomen.
Below kidneys. Pathologic dilatation of the aorta that begins below the level were the arteies that supply blood to the kidneys are located.
Dilated aorta. An aortic aneurysm is an aorta which is larger than it is supposed to be. "acute" refers to the sudden onset of symptoms. The aneurysm can cause pain by suddenly enlarging, encroaching on surrounding parts of the chest or abdomen, or rupturing.
Acute what? Acute rupture of an aortic aneurysm? Or do you mean acute aortic dissection with acute aneurysm formation with or without rupture?