In this study we have evaluated 301 internal mammary lymphoscintigraphies. The results were compared with the histology of internal mammary lymphoscintigraphies, lymphatic chain and axillary lymph nodes, with the anatomo-pathological stage of the disease, with primary tumor site, and also with patients survival. The influence of breast surgery and radiotherapy on the internal breast is shown in the results of the said 301 internal breast lymphscannings. We understand LCMI as a procedure that helps to evaluate the disease stage, to plan therapeutics, to provide a prognosis factor.