Figure 12b. Conventional chondrosarcoma of the rib in a 70-year-old man who presented with a painless anterior chest wall mass. (a) Lateral chest radiograph shows a mass (white arrows) overlying an anterior rib. Faint calcific opacity is seen (black arrow). (b) Axial CT scan demonstrates prominent chondroid matrix mineralization (arrows) to much better advantage and involvement of the costosternal junction. (c) Photograph of the axially sectioned gross specimen reveals the lesion clearly arising from the anterior rib and costal junction (R, arrows) and the lobular growth architecture (C) typical of hyaline cartilage neoplasms.