Fig. 2

62-year-old male presented with fever of unknown origin with history of renal transplantation. a, b Axial fused PET/CT image of the abdomen and same level axial CT of the abdomen showing large metabolically active hepatic focal lesions with central necrosis. c, d Axial fused PET/CT image and axial CT image of the lower abdomen showing small segment of sigmoid colon FDG avid mural thickening (yellow circles) that showed persistent increased activity in delayed imaging (not shown here). e, f Axial fused PET/CT and CT images of the upper pelvis showing regional enlarged metabolically active presacral lymph nodes (white arrows). Pathology from the sigmoid colon revealed adenocarcinoma