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Fig. 6B —40-year-old woman who presented with bloody nipple discharge of left breast. No microcalcifications were detectable on mammography. Transverse third contrast-enhanced T1-weighted MR image shows clustered ring enhancement after washout (arrows). This type of clustered ring enhancement is thought to be subtype of clumped enhancement. Histologic evaluation of mastectomy specimen revealed ductal carcinoma in situ (DCIS). One physiopathologic explanation is that intraductal carcinoma with abundant blood supply exhibits washout pattern and contrast medium that accumulates in periductal stroma or ductal wall contributes to this phenomenon.