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An 80-year-old male postoperative rectosigmoid colon cancer patient. a Contrast-enhanced axial CT image showed no evidence of abnormal wall thickening or a mass-like lesion at the anastomosis site. b, c Axial PET and PET/CT fusion images showed intense focal FDG uptake (arrow) around the rectal anastomosis site (SUVmax: 6.1). This finding was reported to be a recurrent tumor. Local tumor recurrence was confirmed by histopathological examination of the surgical specimen
