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Histological appearance (a) and results of immunohistochemical staining (b–d) of intrahepatic cholangiocarcinoma (ICC). (a) Histologically, ICC is an adenocarcinoma. Immunohistochemically, tumor cells are positive for cytokeratin (CK) 7 (b), CK19 (c), and carcinoembryonic antigen (monoclonal antibody) (d). (Original magnification: ×200 for (a–d)).
