Breast-Conserving Surgery
- Example; lumpectomy/partial mastectomy
(also called a wide excision, segmental mastectomy or quadrantectomy)
- Removes the lump and part of the surrounding tissue
Mastectomy
- Removes the entire breast and the nipple and often some axillary (underarm) lymph nodes
Axillary Node Dissection
If a breast lump has cancer cells, a few lymph nodes located in your axilla (armpit) are removed. This is done to see if the cancer has spread to the lymph nodes. The lymph node dissection (surgery) is often done at the same time as the lumpectomy or mastectomy.
Sentinel Node Biopsy
A sentinel node biopsy is a type of axillary (underarm) node dissection (surgery). The sentinel node is the lymph node most likely to have cancer cells if the cancer has spread. This surgery removes fewer lymph nodes and has less complications than an axillary node dissection.
Before surgery, a radioactive medication (Technicuim 99) is injected in the skin. It is injected next to the tumour or next to the area of the previous lumpectomy. An hour after the injection, a special picture is taken. This is called "mapping". The mapping helps to pinpoint the lymph node(s) which have picked up the radioactive medication.
At the beginning of the surgery, a small amount of blue dye (Lymphazurin 1%) is injected around the tumour or around the area of the previous lumpectomy. The dye enters the lymph channels. In 20 minutes the dye turns the sentinel node(s) blue. The sentinel node is also detected using a special instrument called the gamma probe. It looks for the most radioactive lymph nodes.
The sentinel node(s) are removed and sent to the lab to be examined right away. This exam is called a ‘frozen section’. If these lymph nodes do not contain cancer, it is unlikely that cancer cells will be found in the other lymph nodes of the axilla (armpit). No more lymph nodes will need to be removed. However, if the lymph node does contain cancer, the surgeon will do an axillary node dissection.
After surgery, if the final pathology exam shows cancer cells that were not seen on the frozen section, the surgeon will recommend an axillary node dissection.
A sentinel node biopsy is not recommended if:
- The tumour is very large
- Lymph nodes can be felt in the armpit (axilla)
- You had previous radiation to the breast
- You had chemotherapy before the surgery
- There has been a lot of surgery to the breast in the past