Fig. 3. Large duct type iCCA.
(A) Columnar tumor cells arranged in irregular glandular structures, invading multiple portal areas adjacent to the carcinoma; (B) High columnar tumor cells secret mucus; (C) S100 calcium-binding protein P-positive in IHC staining. iCCA, intrahepatic cholangiocarcinoma; IHC, immunohistochemical.