The histopathological criteria used in the analysis of gallbladder specimens was as follows:
Absence of cholecystitis: normal gallbladder and/or absence of lymphocytic infiltration.
Acute cholecystitis (AC): transmural neutrophilic infiltration ± involvement of adventitia (pericholecystitis) ± gangrene.
Chronic cholecystitis (CC): lymphocytic infiltrates without neutrophilic infiltrates.
Acute superimposed on chronic cholecystitis (ACC): the presence of acute and chronic features as noted above.
Acalculous Cholecystitis: AC or ACC without gallstones
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