Statement: All subjects in the primary trial and the secondary trial will be adminstered 4 mCi Tc-99m sestamibi and undergo Molecular breast imaging.
Primary_evidence: INTERVENTION 1:    Overall Population   Each subject served as her own control, with imaging of each mass by both the test and control modalities. Specificity difference is a single measure for the overall ITD population.
Secondary_evidence: INTERVENTION 1:    Molecular Breast Imaging   Molecular breast imaging performed after injection of 4 mCi Tc-99m sestamibi and again after 8 mCi Tc-99m sestamibi.