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Objective:To develop and validate a radiomic nomogram based on an apparent diffusion coefficient (ADC) map for differentiating benign and malignant lesions in suspicious breast findings classified as Breast Imaging Reporting and Data System (BI-RADS) category 4 on breast magnetic resonance imaging (MRI).Methods:Eighty-eight patients diagnosed with BI-RADS 4 findings on breast MRI in the First Affiliated Hospital of China Medical University from December 2014 to December 2015 were retrospectively analyzed in this study.Sixty-three were randomized electronically to establish forecasting models,and the other 25 were used for validation.Radiomic features based on the ADC map were generated automatically by Artificial Intelligence Kit software (A.K.software;GE Healthcare,China).Feature reduction was conducted using the Mann-Whimey test and Spearman correlation after pre-treatment.A prediction model of ADC radiomics was established by logistic linear regression and cross-validation.A nomogram was established based on ADC radiomic features,pharmacokinetics and clinical features,including the morphology and ADC value for breast BI-RADS 4 lesions on MRI.Results:A total of 396 radiomic features were extracted automatically by the A.K.software.Five features were selected after pre-processing,Maun-Whitney tests and Spearman correlation analysis.The area under the ROC curve of the prediction model comprising ADC radiomic features was 0.79 when the cutoff value was 0.45,and the accuracy,sensitivity and specificity were 80.0％,0.813 and 0.778,respectively.A visualized differential nomogram based on the radiomic score,pharmacokinetics and clinical features was established.The decision curve showed good consistency.Conclusions:ADC radiomic features could provide an important reference for differential diagnosis between benign and malignant lesions in suspicious BI-RADS 4 lesions.The visualized nomogram based on ADC radiomic features,pharmacokinetics and clinical features may have good prospects for clinical application.