Hand-held Gamma Camera in the SNOLL Procedure

In France, breast cancer affects approximately 53,000 new cases per year. The investigators have to take care more and more women with subclinical lesions (nonpalpable), and it represents around 25% to 35% of the diagnosed breast cancers. The main problem of the surgical management of these lesions is the quality of preoperative identification which determines the quality of surgery and oncological and cosmetic outcomes. For this type of lesion, SNOLL (Sentinel Node and Occult Lesion Localization) procedure could be proposed. This is a radioactive labeling of the tumor site and sentinel lymph node (SLN). The investigators want to evaluate the potential benefits of using a hand held camera called TreCam in this SNOLL procedure. This camera permits to obtain nuclear imaging at the bedside and in the operating theater.