Ultrasound (US) is the preferred imaging examination
for the diagnosis of acute cholecystitis and is the first
method used when the clinical presentation is suggestive
of biliary pathology. The main findings of acute calculous
cholecystitis on US include in addition to the presence
of stones: distension of the gallbladder lumen,
gallbladder wall thickening, a positive US Murphy sign,
pericholecystic fluid [5,6] and a hyperemic wall upon
evaluation with Color Doppler [7,8].