The aim of the study is to evaluate the ability of a specified and reproducible imaging protocol for distinguishing patients with a high axillary tumoral load from the ones with a low tumoral load. At the same time, as the initial nodes receiving lymph drainage should be the ones commonly affected, identifying these nodes injecting diluted methylene blue in the retroareolar parenchyma and studying their tumoral load could help selecting patients with high from those with low axillary tumoral load.