The names Tabar and Dean are associated with high-quality mammography worldwide. In this fourth edition of the bestselling Teaching Atlas of Mammography, readers are again invited to share in the authors experience of analyzing and evaluating mammograms. Their systematic approach not only instills a full understanding of the principles of mammography but also provides the requisite knowledge and tools to arrive at a highly accurate differential diagnosis. Rather than starting with the diagnosis and demonstrating typical findings, the approach of this atlas is to teach the reader how to analyze the image and reach the correct diagnosis through proper evaluation of the mammographic signs. Prerequisites for the perception and evaluation of the mammographic findings are optimum technique, knowledge of anatomy, and understanding of the pathological processes leading to the mammographic appearances.