Unexpected focal fluorodeoxyglucose uptake in main organs; pass through or pass by?

Figure 3 Diffuse intestinal fluorine-18 fluorodeoxyglucose uptake. A: 76-year-old woman diagnosed with cecal cancer and multiple metastases/seeding nodules. Primary cecal cancer is observed in the right lower abdomen (arrow) and diffuse intestinal uptake is also shown. The diffuse uptake may be physiological; however, pathological lesions may be obscured by the intense intestinal uptake; B: 79-year-old woman diagnosed with mantle cell lymphoma, and also had a history of colon cancer about three decades ago. Mixed focal and diffuse intestinal uptake is challenging.