Breast cancer is currently the most common cancer in women, and is a major diagnostic and therapeutic problem. The radio-surgical conservatrice therapeutic management has become a standard for most tumors : stages I and II. Furthermore, the use of preoperative treatment extends the indications of conservative treatment which was initiall limited to tumors less than 3cm, unifocal, and non-inflammatory to larger tumors. Our study reports 20 patients cases of breast cancer, collected at the surgical department?s of the military hospital avicenne marrakech?s , over a period of 2 years from junuary 2015 to december 2016 who underwent conservative tratment.