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

Figure 4 Incidental prostate fluorine-18 fluorodeoxyglucose uptake. A 74-year-old man diagnosed with small bowel gastrointestinal stromal tumor. A: On the initial image, known small bowel gastrointestinal stromal tumor with low uptake is observed (arrow); B: Also, nearly symmetrical low prostate uptake is shown; C: An incidental focal uptake is observed beneath urinary bladder (arrow) on the five-year follow-up image; D: The uptake is at the left side of prostate (maximum standardized uptake value 5.6) and it was proved histopathologically as an adenocarcinoma of prostate.