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Fig. 2E —Five enhancement patterns of gallbladder diseases showing flat gallbladder wall thickening on portal venous phase MDCT. 70-year-old woman with acute cholecystitis. In this pattern, weakly enhancing thin inner layer (white arrow), suggesting mucosal inflammation, with nonenhancing, thick outer layer (black arrow), suggesting subserosal edema and pericholecystic fluid with luminal distention of gallbladder (type 5), is seen. Weakly enhancing layer shows rather fuzzy margin.