Figure 3. Transverse FDG PET mammography image demonstrates two focal abnormalities. Lesion 1 represents invasive carcinoma that was depicted at conventional mammography. Lesion 2 represents a 0.4-cm noninvasive papillary carcinoma, which was not visible at conventional mammography. Directed US was used to localize the mass, which was then evaluated with core-needle biopsy.