Figure 5d. Images of a 41-year-old woman with a 1.8-cm mass in the left breast. (a, b) Mediolateral oblique and craniocaudal conventional mammograms of the left breast demonstrate architectural distortion (arrows) in the superior portion. (c) US scan of left breast demonstrates a solid mass (*) at the site of mammographic abnormality. (d) Transverse PET mammography image of the left breast depicts a single focus of increased FDG activity (arrows) at the site of the mass. Histologic examination demonstrated a 2.0-cm invasive ductal adenocarcinoma with associated ductal carcinoma in situ.