Inclusion Criteria:  Age > 18 years. Female gender. Histologic diagnosis of invasive breast cancer or ductal carcinoma in situ. Tumor size at least 1 cm in diameter as visualized on mammogram or US. A staging, pre-operative breast MRI is considered to be clinically indicated. Ability to voluntarily provide informed consent to participate prior to any study-related assessments/procedures being conducted.  Exclusion Criteria:  Absolute contraindication to MRI, including presence of implanted electrical device. (pacemaker or neurostimulator incompatible with MRI), aneurysm clip, or metallic foreign body in or near eyes. Severe claustrophobia. Contraindication to the use of gadolinium-based intravenous contrast, including anaphylaxis. Any known history of nephrogenic systemic fibrosis (NSF). History of median sternotomy. Pregnancy. All women of child-bearing age will be questioned about possible pregnancy status. In women who are unsure of pregnancy status, a urine pregnancy test will be performed. Patients who have received neoadjuvant chemotherapy for their current diagnosis. Known compromised renal function including chronic, severe kidney disease (GFR < 30 ml/min/1.73m2), or acute kidney injury.