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Fig. 2C —Five enhancement patterns of gallbladder diseases showing flat gallbladder wall thickening on portal venous phase MDCT. 38-year-old man with adenomyomatosis. Axial CT scan shows diffuse, segmental gallbladder wall thickening with two layers. Enhancement degree and thickness of inner (white arrow) and outer (black arrow) layers were not strictly categorized (type 3). However, enhancement degree is same or less than that of liver parenchyma. We can observe subtle low-attenuated foci (arrowheads) within inner enhancing layer, thereby suggesting dilated Rokitansky-Aschoff sinuses.