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From histogram analysis the value of computed tomography for early detection of breast carcinoma or differentiation of benign and malign processes of the breast was evaluated. The results show, that CT is not applicable and gives no improvement of diagnostics.

As every diagnostics also roentgenological diagnostics of breast carcinoma involves misinterpretations. By exact evaluation technique, profound clinical investigation and profound knowledge of x-ray symptoms errors can be reduced. The close cooperation of referring physician, radiologist and pathologist is an essential for the improvement of the diagnostics of carcinoma. The radiologist must know possible errors exactly to achieve high rates of correct diagnosis. Especially in the evaluation of mammography clinical and pathologic-anatomic knowledge is required besides much experience in image analysis.

Analysing capabilities and limitations of the presently available diagnostic imaging methods for diseases with obstruction of the biliary pathways, proposals for a diagnostic strategy are derived for the various diagnostic methods, considering technical, economic and capacity aspects. Indications for all the methods (sonography, computed tomography, ERCP and PTC), single or combined, still exist for the various diseases and problems. The diagnostic strategies were derived from our practical experiences with these methods. Other economic or local conditions will possibly modify the strategies. Therefore they should not be seen as dogma.