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(a, b) Sonograms show a BI-RADS category 3 lesion (arrow) in a woman aged 43 years at 1-year follow-up. (a) This lesion was described as 5-mm clustered microcysts at 1-year follow-up. (b) At 2-year follow-up, the lesion had suspicious changes and was reclassified as a BI-RADS category 4a solid lesion. The lesion was not detected with mammography in either year. At biopsy, the lesion was determined to be an 18-mm invasive lobular cancer (N0).
