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Fig. 2D —Five enhancement patterns of gallbladder diseases showing flat gallbladder wall thickening on portal venous phase MDCT. 63-year-old man with calculus chronic cholecystitis. In this pattern, differential point with type 3 is thin inner enhancing layer (white arrow) showing weak enhancement, fuzzy margin, and luminal collapse (type 4). Thin outer layer (black arrow) does not show enhancement.