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Computed tomography (CT) scan without and with contrast shows a distended gallbladder, measuring about 4.7 cm in the transverse dimension, with wall thickening, which measures up to 0.5 cm, increased enhancement in the gallbladder wall, pericholecystic fluid, and inflammatory stranding of the surrounding fat planes. There is a gallstone in the gallbladder neck; however, it is not easy to detect on CT because its attenuation is similar to the surrounding bile.
Impression: These are diagnostic findings of acute cholecystitis.