1.2.Optical scans Since 2016, in the gynecology department of Montpellier University Hospital, photographs of the chest are taken for each patient who undergoes a BCS. Preoperative, intraoperative and postoperative 3D optical scans are also done. Optical scanning are obtained with the sensor structure 3D scanning. Acquisitions take few minutes. Preoperatively and postoperatively, patients are on standing position, arms abducted 45° with anatomical landmarks marked on the surface of the skin (manubrium of sternum, xiphoid process, top edge of the mammary gland, submammary fold). Intraoperatively, the tumor is localized by radioguided occult lesion localization and is marked on the surface of the breast. Two acquisitions are taken, before and after the tumor has been localized, with patients placed on the supine position, arms abducted 90°.