FIGURE 12. CT (A), PET (B), and fused images (C) in patient with history of cancer. On first examination of PET image alone, possibility of peritoneal or bowel metastasis existed. Examination of CT and fused image showed lesion was actually lytic bone metastasis, in this case from thyroid cancer. This example illustrates how PET/CT helped differentiate peritoneal or bowel disease from disease in bone of pelvis.