Biliary histological features in the liver biopsies from hamsters with the experimental opisthorchiasis felinea. (A) Intact animal. (B) High-grade biliary neoplasia caused by O. felineus three months p.i. (C) Cholangiocarcinoma in the liver of hamster as a result of a combined action of O. felineus and dimethylnitrosoamine, three months p.i. BD, bile duct; OF, O. felineus; CCC, cholangiocarcinoma. High-grade biliary neoplasia is indicated with arrows. Pictures 3A and 3C were kindly provided by Maksimova GA.