[Analysis of 1125 partial breast resections for diagnostic purposes. Occurrence of cancer and its histology].

One thousand two hundred and twenty-five partial breast resections, examined in serial gross sections have been retrospectively reviewed. The percentage of benign lesions in comparison with malignant lesions is 70 per cent-30 per cent. The percentage of malignant lesions is maximum (43%) in clustered microcalcifications which are so the best criteria of malignancy. A diagnosis of non infiltrating carcinoma has been misdiagnosed at the first examination in 6 per cent of cases. This misdiagnosis is partially explained by very small foci of carcinoma and recent recognition of certain histological types of early carcinoma. It must be noticed the unsuspected frequence of carcinoma (17%) detected by random in ipsilateral breast tissue from plastic surgery, after controlateral reconstruction for carcinoma. The analysis of benign lesions associated with carcinoma shows a significative frequent association with carcinoma in two types of lesion: radial scar and late phase of blunt duct adenosis.