Cerebral angiography is a test used to detect blockages of the arteries or veins.
A cerebral angiogram can detect the degree of narrowing or obstruction of an artery or blood vessel in the brain, head, or neck. It is used to diagnose stroke and to determine the location and size of a brain tumor, aneurysm, or vascular malformation.
Image: Angiography showing a small aneurysm.
What happens during cerebral angiography?
This test is usually takes up to 3 hours to perform, followed by a 6-8 hour resting period.
The patient, wearing a hospital or imaging gown, lies on a table that is wheeled into the imaging area. While the patient is awake, a physician anesthetizes a small area of the leg near the groin and then inserts a catheter into a major artery located there.
The catheter is threaded through the body and into an artery in the neck. Once the catheter is in place, the needle is removed and a guide wire is inserted. A small capsule containing a radiopaque dye (one that is highlighted on X-rays) is passed over the guide wire to the site of release. The dye is released and travels through the bloodstream into the head and neck. A series of X-rays is taken and any obstruction is noted.
Patients may feel a warm to hot sensation or slight discomfort as the dye is released.
What do the results show?
Cerebral angiography shows the cerebral arteries as they course through the brain.
Aneurysms are seen as bulging areas on the x-ray images.
Reference: The National Institute of Neurological Disorders and Stroke