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Fig. 2A —Five enhancement patterns of gallbladder diseases showing flat gallbladder wall thickening on portal venous phase MDCT. 54-year-old man with gallbladder cancer. Axial contrast-enhanced CT image shows heterogeneously enhancing thick one-layer pattern (arrowheads, type 1). This pattern of gallbladder wall thickening includes gallbladder cancer and special forms of chronic cholecystitis, such as xanthogranulomatous cholecystitis.