ࡱ> ,7- @ Pbjbj00 .$RRP2222F  ^p$  $ R jjj  LLLjv Lj LL+ w R 0uV2@C  0 K , w w $0N"Lp d262THE BATH BREAST UNIT PATIENT INFORMATION SHEET Sentinel Lymph Node Biopsy  INCLUDEPICTURE "http://jnci.oxfordjournals.org/icons/toc/rarrow.gif" \* MERGEFORMATINET  What is it: Sentinel lymph node biopsy is the surgical removal of one or more small lymph glands from the axilla (armpit) that lies close to the breast.  INCLUDEPICTURE "http://jnci.oxfordjournals.org/icons/toc/rarrow.gif" \* MERGEFORMATINET  Why is it done: when treating patients for breast cancer it is important to know whether the cancer has spread outside the breast. This has a strong bearing on how the cancer is behaving and what treatments may be required in addition to surgery. At present the best method to detect such spread is to analyse some of the lymph nodes in the armpit because this area is often the first place affected outside of the breast. The most reliable way to find this out is to actually remove some of these lymph nodes at an operation. Unfortunately, there are no simple tests that can reliably give us this information, without actually doing an operation. It is thought that the sentinel lymph node (SLN) is the pivotal node that drains the breast and the tumour. If the breast cancer has spread it is most likely to have spread to this node first.  INCLUDEPICTURE "http://jnci.oxfordjournals.org/icons/toc/rarrow.gif" \* MERGEFORMATINET How is it done: The SLN is removed during the main operation to excise the breast cancer. Before the operation a small amount of weakly radioactive material is injected under the nipple. Images are taken using a special camera to show where the SLN is located. During the operation itself a blue dye is also injected into the breast. Using these two dyes one can increase the reliability of the procedure. The surgeon will then look for and remove the SLN, which should be both blue and weakly radioactive.  INCLUDEPICTURE "http://jnci.oxfordjournals.org/icons/toc/rarrow.gif" \* MERGEFORMATINET How reliable is this technique: This is an accurate and reliable test but it is important to understand that it is NOT absolutely 100% accurate. In about 1 out of 10 cases the surgeon may not be able to find the SLN, in which case it may be necessary to perform an axillary dissection whereby the majority of the lymph nodes in the lower armpit are removed. Also, there is a small chance that test could give a falsely reassuring result (in less than 1 out of 10 cases). To try and reduce this chance of error we frequently try to remove more than one lymph node at the time of the procedure.  INCLUDEPICTURE "http://jnci.oxfordjournals.org/icons/toc/rarrow.gif" \* MERGEFORMATINET What are the possible complications: Most patients would not develop problems and complication from this part of the operation. However, obviously the area will be sore and uncomfortable immediately afterwards, it may be swollen and your shoulder movements will be reduced somewhat. The discomfort should improve rapidly as the days pass and shoulder movements should return to normal. Some patients may develop other problems, such as a wound infection, post-operative bleeding or the development of a fluid collection in the wound itself (a seroma). These are not major problems and should be readily treatable. A seroma might need to be drained with a needle in the outpatient clinic afterwards. There is a very small risk that arm or hand may become swollen and enlarged afterwards, a condition called lymphoedema. The blue dye used for the test does have a number of possible side effects (the radioactive dye does not have any such problems). It will discolour the skin of the breast where the injection was placed. This discolouration may persist for many months and indeed it may be permanent in some women. The dye makes people turn grey in colour and their urine turns green. This discolouration may persist for a few days. Lastly, a small number of people are allergic to the dye. Minor allergic reactions are seen in just 2 out of every 100 patients. Major allergic reactions (anaphylaxis) are seen in 1 every 500 patients.  INCLUDEPICTURE "http://jnci.oxfordjournals.org/icons/toc/rarrow.gif" \* MERGEFORMATINET  What happens next: After the operation has finished the SLN is analysed by a pathologist to find out what is happening at a microscopic level. Obviously, we hope that no cancer cells are seen. However, it is very important for you to understand that if tumour cells were found to be present in the SLN a second operation might be required at a later date to remove the remaining lymph nodes in the armpit as there is a strong chance that these nodes could harbour cancer cells within them as well. 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