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Fig. 4A —57-year-old man with stage pT3 gallbladder cancer that was understaged as T2 on axial CT images. Axial CT scan shows nodular lesion (arrow) in body of gallbladder and subtle hyperattenuation of adjacent pericholecystic fat (arrowheads). Observers considered lesion to be cholecystitis accompanying cancer because of weak enhancement of pericholecystic fat.