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Fig. 4. —51-year-old woman who had undergone right 12-o'clock axis lumpectomy and radiation therapy for infiltrating lobular carcinoma more than 5 years previously. Mammogram (not shown) revealed mildly dense breast tissue with no suspicious findings. Contrast-enhanced fat-saturated T1-weighted sagittal MR image of right breast shows low signal at site of clips from prior lumpectomy in right 12-o'clock axis. In 6-o'clock axis, spanning 2.3 cm is clumped, linear enhancement (arrows), highly suggestive of malignancy. MR imaging—guided needle localization and surgical excision yielded ductal carcinoma in situ. Subsequent mastectomy was performed.