Postoperative pathology revealed that the mass in segment S8 was moderately differentiated ICC, measuring 3 cm × 2 cm × 2 cm, with immunohistochemical results: CK7 (+), CK19 (+), hepatocyte (–), GS (+), GPC3 (–), and Arg (–). Here, KRT19 is linked to intrahepatic cholangiocarcinoma.