A mastectomy is used to remove all breast tissue from a breast. It's often done to treat breast cancer. It can also prevent breast cancer in those with a very high risk of developing it. Mastectomy to remove one breast is called a unilateral mastectomy. Removing both breasts is called a bilateral mastectomy.

Mastectomy for breast cancer treatment

A mastectomy may be a treatment option for many types of breast cancer. Mastectomy might be the first treatment for:

• Ductal carcinoma in situ, also called DCIS or noninvasive breast cancer.
• Stages 1 and 2 breast cancer, also called early-stage breast cancer.
• Paget's disease of the breast.
• Breast cancer that comes back after treatment, also called locally recurrent breast cancer.

For some types of breast cancer, a mastectomy happens after chemotherapy, such as for:

• Stage 3 breast cancer, also called locally advanced breast cancer.
• Inflammatory breast cancer.

Many people with breast cancer can choose between mastectomy and lumpectomy for breast cancer surgery. Mastectomy removes all of the breast tissue. Lumpectomy is breast-conserving surgery. It removes just the cancer and some tissue around it. Most people who have a lumpectomy also have radiation therapy.

Your healthcare team may recommend a mastectomy instead of a lumpectomy with radiation if:

• You have two or more areas of cancer in separate parts of the breast.
• You have widespread calcium deposits, called microcalcifications, throughout the breast that show as cancer after a breast biopsy.
• You've had radiation treatment to the breast region and the breast cancer has come back in the breast.
• You're pregnant and radiation is a risk to the unborn child.
• You've had a lumpectomy, but cancer is still present at the edges of the operated area and there is concern about cancer spreading in the breast.
• Your DNA gives you a high risk of developing a second cancer in your breast.
• You have a large area of cancer compared with the overall size of your breast. You may not have enough healthy tissue left after a lumpectomy to achieve an acceptable cosmetic result.
• You have a connective tissue disease, such as scleroderma or lupus, and may not tolerate the side effects of radiation to the skin.

Mastectomy to prevent breast cancer

You might consider a mastectomy if you don't have breast cancer but have a very high risk of developing the disease.

A preventive mastectomy involves removing both of your breasts. This greatly reduces your risk of developing breast cancer in the future. However, it does not eliminate your risk. Other names for this procedure are prophylactic mastectomy and risk-reducing mastectomy.

A preventive mastectomy is for those with a very high risk of breast cancer. You might have a very high risk if you have a strong family history of breast cancer. Your risk also may be high if you have DNA that increases the risk of breast cancer.

Risks of a mastectomy include:

• Bleeding.
• Infection.
• Delayed healing.
• Pain.
• Swelling in your arm if you have an axillary node dissection, called lymphedema.
• Formation of hard scar tissue at the surgical site.
• Shoulder pain and stiffness.
• Numbness in the chest.
• Numbness under your arm from lymph node removal.
• Buildup of blood in the surgical site, called hematoma.
• Changes in the way your chest or breasts look after surgery.
• Changes in the way you feel about your body after surgery.

Meet with your surgeon to discuss your options

Before your surgery, you'll meet with members of your surgical team to discuss your operation. This is a good time to ask questions and to make sure you understand the procedure, including the reasons for surgery, the risks and other treatment options.

Your surgeon may talk about breast reconstruction with you. Breast reconstruction is surgery to restore shape to the breast. Many factors go into deciding whether reconstruction can be done and when. Sometimes it's possible to have the reconstruction done right away after your mastectomy. Typically, the reconstruction is started at the time of your mastectomy and is completed with another procedure several months later. Sometimes, reconstruction may involve more than one procedure.

Breast reconstruction may involve using:

• Breast expanders with saline or silicone implants.
• Your body's own tissue, called autologous tissue reconstruction.
• A combination of tissue reconstruction and implants.

Breast reconstruction is a complex procedure performed by a plastic surgeon, also called a reconstructive surgeon. If you're planning breast reconstruction at the same time as a mastectomy, you'll meet with the plastic surgeon before the surgery. The plastic surgeon will coordinate with the breast surgeon to be available at the time of surgery.

Before surgery, you may need to consider whether you'll have radiation therapy afterward. Radiation therapy may impact your breast reconstruction options. Some people know they will need radiation as part of their treatment plan. Others may not know whether they need radiation until after the results of the mastectomy are known. You may meet with a radiation oncologist before or after surgery to discuss benefits and risks.

Preparing for your surgery

Your healthcare team will give you instructions before surgery. You may need to:

• Tell your healthcare team about any medicines, vitamins or supplements you're taking. Some substances could interfere with the surgery.
• Stop taking aspirin or other blood-thinning medicines. If you take blood thinners, your healthcare team will tell you when to stop taking these medicines. Sometimes a different blood-thinning medicine is given around the time of surgery.
• Stop eating before surgery. You'll receive specific instructions from your healthcare team about eating. You may need to stop eating several hours before surgery. You may be given the OK to drink liquids up to a certain time before surgery. Follow the instructions from your healthcare team.
• Make a plan for after surgery. Ask your healthcare team if you'll need to stay in the hospital. Most people go home the same day. Plan for a ride if you're told you can go home the same day. If you need to stay in the hospital another day, bring a robe and slippers to help make you more comfortable. Pack a bag with your toiletries and something to help you pass the time, such as a book.

After surgery the breast tissue and lymph nodes are sent to a lab for testing. Results from the lab will show whether all the cancer was removed and whether cancer was found in the lymph nodes. The results are typically available within a week or two after surgery. Your healthcare team will explain what the results mean and what the next steps will be in your treatment.

If you need more treatment, you may be referred to:

• A radiation oncologist to discuss radiation treatments. Radiation may be recommended for large cancers or for lymph nodes that test positive for cancer. Radiation also may be recommended for cancer that spreads into the skin, nipple or muscle, or for cancer that remains after the mastectomy.
• A medical oncologist to discuss other forms of treatment after the operation. These may include hormone therapy if your cancer is sensitive to hormones or chemotherapy or both.
• A plastic surgeon if you're considering breast reconstruction.
• A counselor or support group to help you cope with having breast cancer.