Figure 3a. (a) Left mediolateral oblique mammogram obtained in a 54-year-old woman demonstrates an ill-defined mass (arrow). Histopathologic analysis yielded invasive ductal carcinoma, with prominent mucin production. A metallic wire identifies the site of a previous biopsy of a benign lesion. (b) Collimated mediolateral oblique magnification mammogram obtained 20 months after breast-conservation therapy demonstrates numerous linear and pleomorphic microcalcifications (arrows) immediately anterior to the lumpectomy bed. Histopathologic analysis yielded recurrent invasive ductal carcinoma with comedo-type DCIS. A metallic wire identifies the cutaneous lumpectomy scar.