Figure 6. Panoramic dental CT scan in a 60-year-old man with advanced periodontal (arrowheads) and endodontal (straight arrows) lesions. Note how periodontal disease travels down the sides of the root, while endodontal disease affects the root apex. A radiopaque post from a root canal procedure is seen in a tooth with an endodontal lesion (curved arrow). (Reprinted, with permission, from reference 14.)