 Participants will be selected at the time of the MRI interventional procedure by the radiologist who is protocoling the MRI examinations and who is an investigator on this protocol. Any known breast lesion, benign or malignant, will be appropriate for evaluation with DCE MRI. Pathology results will be obtained for each patient as a result of surgery or MRI guided biopsy, allowing correlation between the pathology and DCE MRI data. 