Abstract
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% to 10% of the cases, is a complication seen in the setting of major trauma and prolonged critical illness.2
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