Skip to content

    Breast Cancer Health Center

    Font Size

    Modified Radical Mastectomy

    When treating breast cancer, a doctor’s goal is to remove all of the cancer -- or as much of it as possible. Surgery is one of the mainstays of treatment, and a procedure called modified radical mastectomy (MRM) is now a standard surgical treatment for early-stage breast cancers.

    It’s especially helpful for treating early-stage breast cancer that has spread to the lymph nodes. Studies show MRM is as effective as a traditional radical mastectomy, but takes much less of a toll on a woman’s appearance. Because of the success with MRMs, traditional radical mastectomies are rarely done today.

    What Is Modified Radical Mastectomy?

    MRM doesn’t remove chest muscles like a traditional radical mastectomy does.

    During the procedure, the surgeon removes the breast, including the skin, breast tissue, areola, and nipple, and most of the lymph nodes under the arm. The lining over the large muscle in the chest is also removed, but the muscle itself is left in place.

    Following a traditional radical mastectomy, women often have a hollow in the chest. Because the chest muscle is kept in place with an MRM, this doesn’t happen.

    What to Expect During an MRM

    The surgery takes about 2 to 4 hours.

    While you are under general anesthesia, the surgeon will make a single incision across one side of the chest. The skin is pulled back, and the doctor will remove the entire breast tissue, along with the lining over the pectoralis major. Usually, he’ll remove some of the lymph nodes under your arm as well.

    The goal of the surgery is to remove the cancer but preserve as much of the skin and tissue as possible so that you can have breast reconstruction, if you chose.

    Although research has found MRM to be generally safe and effective, like all surgical procedures it can have risks. They include:

    • Bleeding
    • Infection
    • Swelling of the arm
    • Pockets of fluid forming underneath the incision (called seromas)
    • Risks from general anesthesia

    Some people have numbness in the upper arm after surgery. It’s caused by damage to small nerves in the area where the lymph nodes are taken out. There is a good chance that you’ll regain most of the feeling in your arm over time.

    Lymph nodes that are removed will be sent to a lab to see whether the cancer has spread to them.

    Today on WebMD

    Breast Cancer Overview
    From mammograms to living after treatment.
    Dealing with breast cancer
    Get answers to your questions.
    woman having mammogram
    The 3 latest tips to know.
    woman undergoing breast cancer test
    Most abnormalities aren’t breast cancer.
    Resolved To Quit Smoking
    Breast Cancer Treatments Improving
    Woman getting mammogram
    Screening Tests for Women
    serious woman
    Pink badge on woman chest to support breat cancer
    what is your cancer risk
    breast cancer survivors