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A patient being evaluated for metastatic colon cancer. (a) An anterior projection PET image shows known hepatic metastases, as well as an indeterminate focus in the left face (arrow). (b) Transaxial PET through the face shows a distinct hypermetabolic focus (arrow). The corresponding (c) CT and (d) fusion images show this focus to be a periodontal abscess in the maxillary alveolar ridge (arrows).
