Comparison of MRI and CEDM to Evaluate Treatment Response Before Surgery

Inclusion Criteria: * Any woman who has completed or is nearing completion of neoadjuvant therapy for breast cancer and is scheduled for a post-NAT breast MRI and mammogram * Surgery (mastectomy or BCT) planned within 60 days of the MRI Exclusion Criteria: * Women who have a contraindication to the intravenous use of iodinated contrast agent (i.e., allergy to iodinated contrast or severely impaired renal function with a creatinine level \> 1.3 or eGFR ≥45) * Known allergic reaction to gadolinium; patient may be eligible if the referring physician determines that the MRI is medically necessary and if the patient is willing to undergo pre-medication for contrast allergy * Pregnant women * Male patients * Presence of non MR compatible metallic objects or metallic objects that, in the opinion of the radiologist, would make MRI a contraindication * Known or suspected renal impairment. Requirements for GFR prior to MRI as determined by local site standard practice * Women who have already had their standard of care post-NAT mammogram and/or breast MRI