It is advocated to perform breast DWI-acquisitions before contrast administration . However, performing DWI after contrast MRI might be more practical in a clinical context. Several studies  evaluated whether performing breast MRI before or after contrast administration impacts the DWI classifying properties. However, previous research was often based on an interpatient analysis. Therefore, we performed a retrospective intra-patient analysis on perfusion-free ADC-maps before and after contrast administration. A decrease in ADC was observed in post-contrast ADC-values. This was independent of the B0-field strength, and similar for benign and malignant lesions.