 The low incidence of male breast cancer precludes a significant participation of men in the program and men will be excluded. Patients must be able to complete an MR examination. Subjects will be interviewed by one of the investigators for the usual contraindications to MR including pacemakers, metallic implants, severe claustrophobia, aneurysm clips, pregnancy, current lactation, or other conditions precluding proximity to a strong magnetic field. These patients will be excluded if these contraindications are present. 