Magnetic Resonance Imaging of the Brachial Plexus

What This Test Is

The brachial plexus is a bundle of nerves that starts near the neck and branches out to supply feeling and movement to the shoulder, arm, and hand. Magnetic resonance imaging (MRI) uses a strong magnet and radio waves to build clear, cross-sectional images of these nerves and the surrounding soft tissues. Unlike CT scans, MRI does not use X-rays.

Why It May Be Ordered

Your clinician may request this study if you have unexplained shoulder or arm pain, weakness, numbness, or tingling, or after an injury to the neck or shoulder. It can also help evaluate suspected nerve compression, inflammation, or other nerve problems when physical exams and other tests do not give a clear answer.

How to Prepare

You will usually be asked to remove metal objects and may need to change into a gown. Because the scanner uses a powerful magnet, tell the staff about any implants, pacemakers, or metal in your body before the exam. If you tend to feel anxious in enclosed spaces, let the team know so they can help you stay comfortable.

What to Expect During the Exam

You will lie still on a table that slides into the scanner. The machine can be noisy, and you may be given earplugs or headphones. Some images may be taken with and without a contrast dye given through an IV. The scan typically takes a while, and staying still helps produce clear pictures.