Case 45 Answer
BI-RADS 2, Benign. The oval circumscribed mass in the right UOQ has a fatty hilum, and has the classic appearance of an intramammary lymph node. These are most often found in the upper outer breast, but may be seen in any quadrant. Often, spot compression magnification or ultrasound must be performed to show the classic appearance of a lymph node with a thin cortex and fatty hilum. Occasionally, a benign lymph node will lack the classic appearance and warrant further work-up.
See related case below.