Figure 3.

A 47-year-old woman underwent diagnostic mammography for a palpable mass in the left breast at the 3 o'clock position (round metal markers). (A, B) Left mediolateral oblique and craniocaudal views show extremely dense breast tissue without a definite abnormality. Computer-aided detection did not mark anything (not shown here). Retrospective review by two radiologists did not find abnormal findings. (C) Breast ultrasonography shows a lobulated, hypoechoic lesion in the area of a palpable mass. This was confirmed to be invasive ductal carcinoma.