Fig. 3

Histopathological findings (hematoxylin–eosin staining). a Common hepatic duct and cystic duct. The diameter of the cystic duct was 300 μm (arrow), while the common hepatic duct was closed and only bile ductules with a diameter of less than 50 μm were isolated (arrowhead). No apparent inflammation was observed around the cystic duct. The scale bar represents 100 μm. b Connective tissue in the porta hepatis. Severe infiltration of lymphocytes was detected. The scale bar represents 200 μm