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Figure 2a. (a) Collimated left craniocaudal mammogram obtained in a 59-year-old woman shows an ill-defined mass (arrowhead). Histopathologic analysis yielded poorly differentiated invasive ductal carcinoma. (b) Collimated left craniocaudal mammogram obtained 34 months after breast-conservation therapy shows an ill-defined mass (arrowhead) anterior to the lumpectomy bed, which is marked by surgical clips. Histopathologic analysis yielded recurrent poorly differentiated invasive ductal carcinoma.