SLNB is a technique used in early breast cancer wherein only those lymph nodes which are likely to be affected by breast cancer are identified using dual technique- Radio-isotope and blue dye- and removed at the time of surgery. If these lymph nodes, ranging between 1 and 4 are not affected by cancer, it is unlikely the others would be , thus obviating the need for an axillary clearance ( removing all the lymph nodes in the armpit. The advantage of SLNB is that it reduces the incidence of arm swelling( Lymphedema) to less than 5% which is more than 20% after axillary clearance. The shoulder dysfunction is also much lesser after SLNB
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