FIGURE 3. Focal ¹⁸F-FDG uptake in 70-y-old woman with low-grade non-Hodgkin’s lymphoma who was undergoing routine follow-up examination. (A) Coronal, sagittal, and transaxial PET slices show focus of increased ¹⁸F-FDG uptake (arrows) in right upper abdomen. (B) Area of increased uptake (arrows) was localized by PET/CT (left panel) to ascending colon, as seen on corresponding CT image (right panel). Colonoscopy had negative findings, and patient showed no evidence of disease after 16 mo of follow-up. Focus of increased ¹⁸F-FDG uptake was considered to represent physiologic bowel activity.