The three standard projections relative to mammographies of 40 patients with breast cancer pre-operatively classified as T1-T2 were analyzed by computerized morphometric elaborations. This method si able to better define view of images, permetting pre-operative connection of staging, with an increment of 30% if confronted with histologic TNM (pTNM). The utilization of method is discussed to evaluate the best way for the local definition of tumor extension, permitting to use a correctly conservative surgery (quadrantectomy, tumorectomy) in a greater number of patients.