Figure 2a. Screening mammograms in a 58-year-old woman who underwent left breast mastectomy and right breast lumpectomy and radiation therapy for breast cancer 13 years earlier. Linear markers on images are routinely placed on the skin over visible incision sites in women who have previously undergone surgery. (a) Mediolateral oblique and (b) craniocaudal mammograms of the right breast. A density (arrow) seen only on a was detected by the radiologist but not marked at CAD (radiologist-only finding). (c) Mammogram obtained with spot compression shows the density (arrow), in the upper part of the breast, to better advantage. A 0.7-cm infiltrating ductal carcinoma, grade II, was diagnosed at biopsy.