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(A) Irregular cystic dilated tumor glandular ducts with abundant fibrous stroma; (B) Polypoid protuberance in the tumor crypt; (C) IHC staining for mucin 1 shows positive results on the marginal surface of the lumen. DPM, ductal plate malformation; iCCA, intrahepatic cholangiocarcinoma; IHC, immunohistochemistry.
