Abdomen & Pelvis: CT angiogram (CTA) is used in the abdomen and pelvis to detect enlargement of the abdominal aorta known as abdominal aortic aneurysm, aortic dissection, which is caused by a tear in the wall of the aorta. CTA can also detect narrowing or blockage of the major arteries in the abdomen or pelvis. In patients experiencing abdominal pain, especially after eating, CTA can detect narrowing or blockage in the arteries supplying the intestines. Similarly, in patients with unexplained high blood pressure, particularly younger patients, CTA can detect narrowing or blockage of the arteries supplying the kidneys. In patients with pelvic or buttocks pain, especially if exacerbated by walking, CTA can detect narrowing or blockage in the pelvic arteries. CTA is the study of choice to detect or follow up vascular abnormalities in the pelvis following trauma. These include pseudo-aneurysms or dissection, which are both related to injury of the arterial wall.