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A 38-year-old woman revealed normal carcinoembryonic antigen level of 2.8 ng/mL who underwent rectal cancer resection 22 mo ago. 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) image displayed a lymph node but computerized tomography (CT) did not show it clearly. A: CT; B: 18F -FDG PET/CT.
