A sentinel lymph node biopsy is the removal and testing of specific lymph node tissue.
A sentinel lymph node biopsy is often done during cancer-removal surgery or prior to surgery, and is therefore considered both a diagnostic tool breast cancer as well as a treatment for it. The sentinal nodes are the lymph nodes to which cancer would spread first. Sentinel node biopsy is part of the staging process. Staging is an attempt to determine how much the cancer has spread away from the original tumor.
This biopsy is done to determine if cancer cells have spread from the tumor to nearby lymph nodes. Cancer often spreads from the tumor to the nearest lymph node or nodes. These lymph nodes are called the sentinal nodes. It is important to understand that the sentinel node will probably be the first one to get cancer if the cancer has spread. In the case of breast cancer, the sentinal nodes are often found in the armpit.
This is a fairly new procedure and is less invasive than axillary lymph node dissection, which removes a bulk of lymph nodes from under the arm.
Complications are rare, but no procedure is completely free of risk. If you are planning to have this biopsy, your doctor will review a list of possible complications which may include:
- Bleeding or bruising
- Nerve damage
- Allergy to dye
If the lymph nodes are removed, there is an increased risk of the following:
- Delayed wound healing
- Additional pain
- Lymphedema (a condition in which fluids collect under the skin causing swelling)
Some factors that may increase the risk of complications include:
- Recent or long-term illness
- Poor nutrition
- Use of certain medicines
- Bleeding disorders
What to Expect
Prior to Procedure
Your doctor will do a physical exam. The cancerous tissue will be biopsied. Tests may include the following:
- Blood tests
- Urine tests
- A mammogram, in cases of breast cancer
- CT scan —type of x-ray that uses a computer to produce cross-sectional images of the inside of the body
- MRI scan —a test that uses magnetic waves to make pictures of structures inside the body
Talk to your doctor about your medicines. You may be asked to stop taking some medicines up to one week before the procedure, like:
- Aspirin or other anti-inflammatory drugs
- Blood thinners, such as clopidogrel (Plavix) or warfarin (Coumadin)
- The night before, eat a light meal. Do not eat or drink anything after midnight.
- Arrange for a ride to and from the hospital.
Depending on the location of the lymph node, you may be given one of the following:
- General anesthesia —You will be asleep.
- Local anesthesia—The area will be numb.
- Regional anesthesia—Your lower body will be numb.
Description of the Procedure
A blue dye, and often a radioactive tracer, will be injected into the area where the tumor is. It may be done several hours before surgery. The dye and tracer will travel from the tumor area to the sentinal nodes. This will help identify which nodes are the sentinel lymph nodes. The doctor will make a small incision. The sentinel node (or nodes) will be removed. The removed node will be checked for cancer cells. If cancer is found, the doctor will remove the rest of the lymph nodes in that area.
If cancer is not seen in the sentinel node, it is unlikely that the cancer has spread to the other remaining lymph nodes. The other lymph nodes are not removed.
The biopsy takes about 30-60 minutes. Surgery to remove the entire cancer takes longer. Anesthesia prevents pain during surgery and pain medicines are given during recovery.
The result of the sentinel lymph node biopsy determines if additional lymph nodes need to be removed. It can also help determine the severity of your cancer.
Be sure to follow your doctor's instructions. Keep the surgical area clean and dry.
If you develop complications from lymph node surgery, you will need to take some special precautions:
- Do not have blood pressure taken, blood drawn, or shots given in that arm.
- Wear gloves to do dishes, household scrubbing, and yard work.
- Do not wear anything tight on that arm, including elastic in sleeves.
- Do not carry heavy packages, purses, suitcases, grocery bags, etc. with that arm.
- Keep the skin of that arm well-moisturized with a lanolin-containing product.
- Use an electric shaver if you wish to shave your armpits.
- If you had lymph nodes in your armpit removed during breast cancer surgery, participating in a physical therapy program may help to prevent lymphedema.
After arriving home, contact your doctor if any of the following occurs:
- Signs of infection, including fever and chills
- Redness, swelling, increasing pain, excessive bleeding, or discharge from the incision site
- If lymph nodes were removed: redness, warmth, swelling, stiffness, or hardness in the extremity
- Fingers and toes should always be warm and pink. Call your doctor if they become dusky or swollen.
- Nausea and/or vomiting that you cannot control with the medicines you were given after surgery, or which persist for more than two days after discharge from the hospital
- Pain that you cannot control with the medicines you have been given
- Cough, shortness of breath, or chest pain
- New, unexplained symptoms
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National Cancer Institute http://www.cancer.gov
Canadian Cancer Society http://www.cancer.ca
Health Canada http://www.hc-sc.gc.ca/index-eng.php
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