LAB TEST
Breast MRI scan
A breast MRI (magnetic resonance imaging) scan is an imaging test that uses powerful magnets and radio waves to create pictures of the breast and surrounding tissue. It does not use radiation ( x-rays ). A breast MRI is most often done in combination with mammography or ultrasound . It is not a replacement for mammography.
How the Test is Performed
You will wear a hospital gown or clothes without metal snaps or a zipper (sweatpants and a t-shirt). Some types of metal can cause blurry images. You will lie on your stomach on a narrow table with your breasts hanging down into cushioned openings. The table slides into a large tunnel-like tube. Some exams require a…
How to Prepare for the Test
You likely won't need to do anything to prepare for the test. Ask your health care provider about eating and drinking before the test. Tell your provider if you are afraid of tight spaces (have claustrophobia). You may be given a medicine to help you feel sleepy and less anxious. Also, your provider may suggest an…
How the Test will Feel
An MRI exam causes no pain. You will need to lie still. Too much movement can blur MRI images and cause errors. If you are very anxious, you may be given medicine to calm your nerves. The table may be hard or cold, but you can ask for a blanket or pillow. The machine makes loud thumping and humming noises when turned…
Why the Test is Performed
MRI provides detailed pictures of the breast. It also provides clear pictures of parts of the breast that are hard to see or evaluate clearly on an ultrasound or mammogram. Breast MRI may also be performed to: Check for more cancer in the same breast or the other breast after breast cancer has been diagnosed…
What Abnormal Results Mean
Abnormal results may be due to: Breast cancer Cysts Leaking or ruptured breast implants Abnormal breast tissue that is not cancer Scar tissue Consult your provider if you have any questions and concerns.
Risks
MRI contains no radiation. No side effects from the magnetic fields and radio waves have been reported. The most common type of contrast (dye) used is gadolinium. It is very safe. Allergic reactions to this dye are rare. However, gadolinium can be harmful to people with kidney problems who need dialysis. If you have…
Considerations
A breast MRI is more sensitive than a mammogram, especially when it is performed using contrast dye. However, breast MRI may not always be able to distinguish breast cancer from noncancerous breast growths. This can lead to a false-positive result. MRI also cannot pick up tiny pieces of calcium (microcalcifications),…
References
American Cancer Society website. American Cancer Society recommendations for the early detection of breast cancer. www.cancer.org/cancer/breast-cancer/screening-tests-and-early-detection/american-cancer-society-recommendations-for-the-early-detection-of-breast-cancer.html . Updated December 19, 2023. Accessed August…
This is a summary. Read the full article at www.ucsfbenioffchildrens.org (reviewed 14/01/2023).
This page is general information and is not medical advice. It does not replace a registered doctor, and it is not a prescription or a recommendation to use any medicine or test. Prices are listed prices and may change. Always follow the advice of your doctor or pharmacist.