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Acute cholecystitis is the fourth most common cause of hospital admission among patients presenting with an acute abdomen. Imaging plays a key role in the evaluation of patients with acute cholecystitis, because no single clinical finding or laboratory test carries sufficient weight to establish or exclude the diagnosis. 1 The vast majority of cases of acute cholecystitis are due to obstruction of the cystic duct by a gallstone. Acalculus cholecystitis, which accounts for approximately 5% todoi:10.1097/00219246-200505310-00002 fatcat:jtnpkln3bnblzperc7jcnoiueq