n 856 female patients round opacities were found in mammography. In 58 patients of this group the pathological and histological results were known. 125 female patients had been examined more than three times. With these 183 fibroadenomas thus established, criteria were worked out facilitating the decision whether surgical intervention would be required or short-term control could be justified. In comparison with the benign opacities, these histologically confirmed carcinomas were examined according to clinical, thermographical and radiological criteria.