[en] Population-based screening for carcinoma of the breast by mammography has yielded an abundance of data, not all of which have been processed yet, the mammographic (radiographic) data in particular. The present study concerns an analysis of the mammographic signs in the histologically proven carcinomas (invasive and intraductal) detected by these three screening programs. The radiographic signs of the screened carcinomas were compared with those of the clinical carcinomas diagnosed in the Utrecht University Hospital (to be called AZU carcinomas). These AZU carcinomas were taken as reference material, and were therefore analysed in the same way as the screening material. (Auth.)