[Two Cases of Colorectal Liver Metastasis with Localized Biliary Dilatation].

We encountered 2 cases of colorectal liver metastasis with biliarydilatation mimicking cholangiocarcinoma. Case 1: A 70- year-old male patient, who was diagnosed with colorectal cancer and underwent transverse colectomy3 years prior, was preoperativelydiagnosed with cholangiocarcinoma with biliarydilatation of the medial and lateral segments. He underwent left hemi-hepatectomy. The pathological diagnosis was colorectal liver metastasis with intra-biliarytumor thrombosis. Case 2: A 67-year-old male patient was diagnosed with descending colon cancer and cholangiocarcinoma with biliarydilatation of the medial segment. He underwent left hemi-colectomyand left hemi-hepatectomy. The pathological diagnosis was descending colon cancer and colorectal liver metastasis with biliaryinfiltration. The immunopathological findings showed double positivityfor CK20 and CDX2 antibodies and negativityfor CK7 antibodyin these cancer lesions.