Vanishing spot on dual-time-point FDG PET/CT: colonic diverticulitis.

摘要

A 58-year-old man asked for an FDG PET/CT scan for a survey to determine if any malignancy related to the recent history of increasing serum concentration of carcinoembryonic antigen. The scan initially revealed a focal pattern of intense FDG radioactivity in the ascending colon but dramatically lost its existence on the delayed images. Usually, the finding represented physiological intestinal activity and were not attributed to any pathologic condition. However, the subsequent colonoscopy showed diverticulitis in the corresponding site of the ascending colon. Possible causes of this scan finding and the clinical importance will be discussed.