FIGURE 1. A 46-y-old premenopausal patient with palpable lesion of right breast. (A) Craniocaudal mammogram shows fibroglandular tissue without significant abnormalities (BI-RADS 1). (B) SM shows focal tracer accumulation in breast (long arrow) and axillary region (short arrow). Histopathologic examination found invasive ductal carcinoma, with 2 metastatic lymph nodes of 16 examined.