histochemistry, composition of calculi and metaplasia, fibrosis and mucin histochemistry, fibrosis and stone composition indicated a decrease in intraepithelial total acid mucin content in chronic calculous cholecystitis. cases with severe inflammation showed the maximum decrease in sulfomucin, concomitant increase in sialomucin scores and a high incidence of gastric metaplasia. Intestinal metaplasia on other hand did not correlate with the degree of inflammation or sialomucin content. conclusion: this study concludes that normally gallbladder epithelium contains sulfated acid mucins with traces of neutral and sialomucins. the sulfomucin content decreases in chronic calculous cholecystitis and with severe inflammation, total acid mucin content decreases, neutral mucin increases, and there is a higher incidence of gastric metaplasia and pigment stones and correlating with pigment stones. this tends to have an association with severe inflammation, higher degree of fibrosis, gastric metaplasia and presence of sialomucin. Keywords: chronic calculous cholecystitis, Gallbladder stones, Metaplasia, Mucin histochemistryHow to cite this article Anupama P, Menon Nirmala V, Janaky R, Mohammed IL, Alingal MB, Sideeque NA. A histopathological and histochemical study of cholecystitis. Int J Hepatobiliary Pancreat Dis 2014;4:70-80.