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Figure 5b.  FDG uptake in the small intestine. (a) Axial FDG PET images (left image obtained at a higher level than right image) show typical segmental FDG uptake in the ileum. FDG uptake is not present elsewhere in the intestine. (b) Axial FDG PET image shows FDG uptake in the terminal ileum and cecum (arrow) with additional isolated foci of uptake in segments of the small intestine (arrowheads); these foci could be mistaken for mesenteric lymph node metastases.