Case 10

Explanation: A complex cystic and solid mass is one of the possible appearances of fat necrosis when viewed with ultrasound. Although one would normally consider a complex cystic and solid mass a suspicious finding, since we have the typical and benign appearance of fat necrosis on a mammogram, no further work-up or intervention is needed. This case is a good example of how obtaining an ultrasound is unnecessary when you identify a fat-containing mass with mammography. In this case, the BB marker indicating the site of palpable concern in the right breast corresponds well to the fat-containing mass.