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A 35-year-old breast cancer patient with residual disease of the left breast following lumpectomy. (A) Mammography revealed heterogeneously dense breast tissue with scattered microcalcifications (arrows). (B) Ultrasonography revealed irregular tissue distribution in the left breast (square). (C) Histological diagnosis of residual ductal carcinoma in situ (haematoxylin and eosin staining; magnification, ×10).
