Interventional radiology offers an alternative to open surgical procedures and helps identify and address many neurological conditions. One of the most common services done in the lab is an angiogram. This is an X-ray test that uses a special dye and camera to take pictures of blood flow in the blood vessels. For neurology patients, the focus of the test is typically the brain (cerebral angiogram), or the head and neck (carotid angiogram). An angiogram can find a bulge in a blood vessel (aneurysm). It can also show narrowing or a blockage in a blood vessel that slows or stops blood flow. An abnormal pattern of blood vessels or abnormal vessels near a tumor can also be seen.