The first of several satellite volumes to Tabar's Breast Cancer: The Art and Science of Early Detection with Mammography. Each volume will cover in depth a specific class of mammographic findings. Here, casting-type calcifications, and their significance in diagnosing cancer, are explored. Thick-section pathologic specimens are provided to help the reader understand why the mammograms look the way they do. A selection of full color pathologic images is provided in 3-D, allowing one to visualize the breast substructures in their spatial context.