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Fig. 4C —38-year-old woman with microcalcifications on mammography. Coronal third contrast-enhanced T1-weighted MR image shows persistent pattern (arrow). Lesion shows aggregate of enhancing foci in cobblestone pattern (clumped enhancement), and enhancing foci constitute ringlike enhancement pattern. This type of clustered ring enhancement is thought to be subtype of clumped enhancement. Histologic evaluation of excisional biopsy specimen revealed fibrocystic disease. Clustered ring enhancement corresponded to dilated ducts within microcalcifications.