Statement: All patients in the primary trial must have a bilateral breast MRI prior to study entry.
Primary_evidence: Inclusion Criteria:   Women 18-75 years old with newly diagnosed breast cancer who are considered candidates for breast conserving surgery (i.e. lumpectomy). Exclusion Criteria:   Children (<18 years old)   Pregnant or Lactating women   Diabetic patients (Type I or II)   Patients who are scheduled for a sentinel node procedure using radioactive Tc-99m within 24 hours of PEM   Patients who have NOT undergone a standard of care bilateral breast MRI at UC.