How Is an Aneurysm Diagnosed?

An aneurysm may be found by chance during a routine physical exam. More often, an aneurysm is found by chance during an x ray, ultrasound, or computed tomography (CT) scan performed for another reason, such as chest or abdominal pain.

If you have an abdominal aortic aneurysm (AAA), the doctor may feel a pulsating mass in your abdomen. A rapidly growing aneurysm about to rupture can be tender and very painful when pressed. If you are overweight or obese, it may be difficult for your doctor to feel even a large abdominal aneurysm.

If you have an AAA, your doctor may hear rushing blood flow instead of the normal whooshing sound when listening to your abdomen with a stethoscope.

Specialists Involved

You may be referred to a cardiothoracic surgeon, vascular surgeon, or neurosurgeon for diagnosis and treatment of an aneurysm. A cardiothoracic surgeon performs surgery on the heart, lungs, and other organs and structures in the chest, including the aorta. A vascular surgeon performs surgery on the abdominal aorta and on the peripheral arteries. A neurosurgeon performs surgery on the brain, including the arteries in the head, and on the spine and nerves.

Diagnostic Tests and Procedures

To diagnose and evaluate an aneurysm, one or more of the following tests or procedures may be performed:

• Chest x ray. A chest x ray provides a picture of the organs and structures inside the chest, including the heart, lungs, and blood vessels.
• Ultrasound. This simple and painless test uses sound waves to create a picture of the inside of the body. It shows the size of an aneurysm, if one is detected. The ultrasound scan may be repeated every few months to see how quickly an aneurysm is growing.
• CT scan. A CT scan provides computer-generated, x-ray images of the internal organs. A CT scan may be performed if the doctor suspects a TAA or AAA. A liquid dye that can be seen on an x ray is injected into an arm vein to outline the aorta or artery on the CT scan. The CT scan images can be used to determine the size and shape of an abdominal aneurysm more accurately than an ultrasound.
• MRI. MRI uses magnets and radio waves to create images of the inside of the body. It is very accurate in detecting aneurysms and determining their size and exact location.
• Angiography. Angiography also uses a special dye injected into the blood stream to make the insides of arteries show up on x-ray pictures. An angiogram shows the amount of damage and blockage in blood vessels.
• Aortogram. An aortogram is an angiogram of the aorta. It may show the location and size of an aortic aneurysm, and the arteries of the aorta that are involved.