“…Similarly, intramural wall lucencies, defined as irregular discontinuous lucent and echogenic bands in the gallbladder wall [1], were not seen in either of the two patients who developed acalculous cholecystitis, but were seen in 15% of patients who did not develop acalculous cholecystitis. Localized pericholecystic fluid (defined as fluid around the gallbladder alone, not associated with ascites) has been reported to show some specificity for acute cholecystitis [3,8]; however, in our study, this fluid was found in 19% of patients, none of whom developed acalculous cholecystitis.…”