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Fig. 3D. —39-year-old woman who underwent lumpectomy for 2-cm spiculated mass in right lower inner quadrant with associated pleomorphic calcifications on mammography. Pathology yielded infiltrating ductal carcinoma and ductal carcinoma in situ (DCIS) with positive margins. MR imaging was performed for assessment of residual disease. Sagittal MR image obtained day of localization shows needle evident as low-signal artifact in area of spiculated mass (arrow). Mass represents infiltrating ductal carcinoma and DCIS. Residual infiltrating ductal carcinoma and DCIS were also present adjacent to prior biopsy site. Patient underwent mastectomy.