Diagnostic Cerebral Angiogram

Key Points

A diagnostic cerebral angiogram is a highly detailed imaging test that shows blood flow in the brain and neck arteries.
It is used to diagnose and evaluate conditions like stroke, aneurysms, AVMs, and narrowed vessels.
A catheter is inserted into an artery (usually in the groin or wrist) and guided to the brain to inject contrast dye and capture images.
The test is minimally invasive, typically takes 1–2 hours, and involves a short recovery period.
Most patients go home the same day, and risks are low when performed by an experienced neurointerventional team.

Overview

What Is a Diagnostic Cerebral Angiogram?

A diagnostic cerebral angiogram (also called a cerebral arteriogram) is a specialized imaging test used to take detailed pictures of the blood vessels in the brain, neck, and head. It involves using a contrast dye and X-ray technology to detect blockages, aneurysms, arteriovenous malformations (AVMs), or narrowing of the arteries.

This test is performed by a neurovascular specialist and is considered the most accurate method for visualizing blood flow in the brain.

Why Is the Test Done?

Doctors may recommend a cerebral angiogram to:

Evaluate stroke, transient ischemic attack (TIA), or symptoms like dizziness, vision loss, or numbness
Diagnose brain aneurysms, vascular malformations, or narrowed/blocked arteries
Investigate unexplained bleeding, such as from a ruptured blood vessel
Plan for brain or spine surgery, or assess results after treatment
Guide other interventional procedures (e.g., stenting, coiling)

This test provides a clear, real-time view of the brain’s blood vessels that can’t be matched by other imaging like CT or MRI.

What to Expect

Before the Test

You will be given instructions about not eating or drinking for several hours before the procedure.
Let your doctor know if you’re pregnant, allergic to contrast dye or iodine, or take blood thinners.
A consent form will be reviewed and signed.
You may receive a mild sedative to help you relax.

During the Test

You’ll lie on a specialized X-ray table in an interventional radiology suite.
After cleaning the skin, a catheter (thin tube) is inserted through a small incision, usually in the groin or wrist.
The catheter is guided through blood vessels up to the neck or brain.
A contrast dye is injected, and X-ray images are taken in real-time to track blood flow.
The test typically takes 1 to 2 hours, depending on complexity.

You’ll be awake during the procedure but may feel a warm sensation or brief discomfort when the contrast dye is injected.

After the Test

You’ll stay in a recovery area for several hours for monitoring.
It’s important to lie flat and limit movement to avoid bleeding at the catheter site.
Most patients go home the same day with discharge instructions.
Avoid strenuous activity for 24–48 hours.

Are There Any Risks?

Cerebral angiograms are generally safe, but like any medical procedure, there are risks. These may include: