Sentinel node biopsy (SNB) is accepted as gold standard in axillary management of early breat cancer patients. The choice of SN identification procedure is still controversial. The blue dyed method has been increasingly used, but it needs a validation in terms of concordance with the radioguided method, commonly considered ad gold standar procedure in SNB. We evaluated the "same patient" concordance between the two techniques, in aim to understand if the two methods leads to the same SN, as a result to define the accuracy of the blue dye method
