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Fig. 1 —Interpretation method of non-masslike enhancement. First, distribution patterns were classified into three categories (single quadrant/solitary lesion, single quadrant/grouped lesion, and multiquadrant lesion). Second, presence of ductal pattern was assessed in enhancing lesions. Third, internal enhancement was evaluated. Fourth, in addition to BI-RADS MRI descriptors, presence of clustered ring enhancement was also assessed in heterogeneous enhancing lesions (positive or negative).