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Fig. 3A —72-year-old man with stage pT1 gallbladder cancer, which was overstaged as T2. Axial CT scan shows focal wall thickening and nodular lesion (black arrow) in body of gallbladder. Tumor was overstaged as T2 by observers because enhancement of thickened gallbladder wall was considered to represent tumor involvement of whole layer of gallbladder wall (white arrow).