Figure 2b. Screening mammograms in a 72-year-old woman demonstrate fatty breasts and were originally interpreted as negative. Cancer was detected in the upper outer portion of the right breast on the following scheduled screening mammogram 13 months later. (a) CC and (b) MLO views demonstrate a 7-mm mass (arrow) similar in density to the residual glandular tissue in the upper outer quadrant of the right breast. Reasons for possible miss include lucent areas within the mass and possible obscuration by an overlying vessel on the MLO view. CAD (not shown) did not mark this small low-density spiculated lesion.