The Who, What, Where, When and Sometimes, Why.

Lumpectomy Procedure

Lumpectomy surgery

A lumpectomy (also called a breast-conserving surgery, a partial mastectomy or a wide excision) is often done under general anesthesia. This means you’re asleep during the surgery. In some cases, local anesthesia with sedation, or regional anesthesia may be used.

During surgery:

  1. The surgeon makes an incision (cut) in the breast and removes the tumor, along with a small rim of normal tissue around it.
  2. The surgeon closes the skin with stitches, trying to keep the breast looking (as much as possible) like it did before surgery.
  3. The surgeon may also remove some lymph nodes in the underarm area.
  4. The tissue removed during surgery is sent to a pathologist for testing.

Learn about test results and other information found in your pathology report.

Finding the tumor in the breast

In some cases, the surgeon uses special methods to help find the tumor in the breast.

Localization procedure at the time of surgery

Sometimes, breast cancers found by mammography or other imaging cannot be felt (nonpalpable).

If the tumor is nonpalpable, a localization procedure will be done just before surgery. Local anesthesia is used for the localization procedure.

During the procedure:

  • A radiologist will use a mammogram, breast ultrasound or breast MRI as a guide and insert a very thin wire, radioactive seed (radio-seed) or other marker into the breast in the area of the cancer.
  • The surgeon uses the marker as a guide to find the tumor during surgery. The wire, seed or other marker will be removed during surgery.

After the tumor is removed, it’s usually X-rayed. The X-rays show whether the tumor with the wire, seed or other marker was in the removed tissue. This helps the surgeon be sure all the cancer visible on imaging was removed.

Radio-opaque clip during a needle biopsy

Most often, a core needle biopsy is used to diagnose breast cancer. It removes a small amount of tumor tissue.

During a core needle biopsy, a clip should be placed in the breast to mark the location of the tumor. This clip is radio-opaque, meaning it can be seen on an X-ray. You can’t feel the clip.

Later, during a lumpectomy, the surgeon uses the clip, along with the wire, radioactive seed or other marker, as a guide to find and remove the tumor. The clip is usually removed during the surgery.

Assessing margins (Was the entire tumor removed?)

A pathologist checks the tissue removed during breast surgery. By looking at the tissue under a microscope, the pathologist determines whether the entire tumor was removed.

The pathologist looks at the rim of tissue around the tumor (called a margin) to check whether it contains cancer cells. It takes about 1-2 weeks to do a complete check of the tissue.

Clean margins (also called uninvolved margins or negative margins) contain only normal tissue on their outer edges. This means there are no cancer cells at the margins.

In some cases, more surgery is needed to get clean margins.

Learn more about assessing tumor margins.

Assessing lymph nodes (Has cancer spread to the lymph nodes?)

If breast cancer spreads, the lymph nodes in the underarm area (axillary lymph nodes) are the first place it’s likely to go.

During a lumpectomy for invasive breast cancer, some axillary lymph nodes are removed to check for cancer cells. Often, there’s a separate incision in the underarm area (below where your underarm hair grows) to remove these nodes.

The presence or absence of cancer in the axillary nodes affects cancer stage, treatment and prognosis (chances for survival).

Learn more about assessing axillary lymph nodes.

Length of hospital stay

The length of the hospital stay after a lumpectomy depends largely on whether axillary lymph nodes are removed.

Usually, you can go home the same day as the surgery.

Discuss the expected length of your stay with your surgeon and insurance company.

Sentinel node biopsy

If you have a sentinel node biopsy or you don’t have axillary nodes removed, you’ll likely go home the same day as your surgery.

Axillary node dissection

If you have an axillary dissection, you usually go home the same day. In rare cases, people need to stay overnight in the hospital.

A tube (surgical drain) may be placed in the underarm area to collect fluid. This drain stays in for a week to 10 days after surgery.

Learn more about sentinel node biopsy and axillary dissection.  

What to expect after lumpectomy

After a lumpectomy, you’ll likely:

  • Have some soreness in your chest, underarm and shoulder
  • Feel a firm ridge below the scar while it heals (called a healing ridge)
  • Have numbness along the surgical incision (scar)

If axillary lymph nodes are removed during surgery, you may also have some numbness and a burning feeling under and behind your arm. There’s also risk of lymphedema.

Lymphedema is a condition where fluid collects in the arm and/or hand, causing it to swell. Today, lymphedema isn’t common. If it does occur, it usually develops within 3 years of having axillary lymph nodes removed [6].

Learn about the management of surgery-related pain.

Learn more about lymphedema.

Cosmetic issues

Women may choose a lumpectomy over a mastectomy to keep their breast and have it look (as much as possible) like it did before surgery.

However, a lumpectomy may change the look of the breast. Because some tissue is removed, the breast may be smaller and firmer. There will be some numbness and a scar. Ask your health care provider about products that may help reduce the appearance of the scar.

Radiation therapy (usually given after a lumpectomy) can also affect the look of the breast. It may:

  • Make the breast smaller or larger
  • Change the texture of the breast
  • Make the breast feel firmer

When mastectomy may be a better option

Sometimes, things like the location and size of the tumor can make it unlikely a woman will be happy with the look of her breast after a lumpectomy. In these cases, a mastectomy (with or without breast reconstruction) may be the better option.

Breast reconstruction after lumpectomy

While not common, a woman may wish to have breast reconstruction (either at the time of the lumpectomy or later) to maintain a more natural appearance of the breast, or to match the size and shape of the other breast.

These surgeries are complex, so it’s best to meet with a plastic surgeon to discuss your options.

Transportation, lodging, child care and elder care assistance

You may not live near the hospital where you’ll have your surgery.

Sometimes, there are programs that help with local or long-distance transportation and lodging. Some also offer transportation and lodging for a friend or family member going with you.

There are also programs to help you with child and elder care costs.

Learn about transportation, lodging, child care and elder care assistance programs

Susan G. Komen® Support Resources

  • Do you need help? We’re here for you. The Komen Patient Care Center is your trusted, go-to source for timely, accurate breast health and breast cancer information, services and resources. Our navigators offer free, personalized support to patients, caregivers and family members, including education, emotional support, financial assistance, help accessing care and more. Get connected to a Komen navigator by contacting the Breast Care Helpline at 1-877-465-6636 or email to get started. All calls are answered Monday through Thursday, 9 a.m to 7 p.m. ET and Friday, 9 a.m. to 6 p.m. ET. Se habla español.
  • The Komen Breast Cancer and Komen Metastatic (Stage IV) Breast Cancer Facebook groups are places where those with breast cancer and their family and friends can talk with others for friendship and support.
  • Our fact sheets, booklets and other education materials offer additional information.

Updated 12/27/23



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