Latest advances in the pathological understanding of cholangiocarcinomas |
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Authors: | Yasuni Nakanuma Takashi Miyata Tsuneyuki Uchida |
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Institution: | 1. Department of Diagnostic Pathology, Shizuoka Cancer Center, Shizuoka, Japan;2. Department of Hepatobiliary Pancreatic Surgery, Shizuoka Cancer Center, Shizuoka, Japan |
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Abstract: | Cholangiocarcinomas (CCAs) are anatomically classified into intrahepatic, perihilar, and distal types. The gross pathological classification of intrahepatic CCAs divides them into mass-forming, periductal-infiltrating, and intraductal-growth types; and perihilar/distal CCAs into flat- and nodular-infiltrating and papillary types. Unique preinvasive lesions appear to precede individual gross types of CCA. Biliary intraepithelial neoplasia, a flat lesion, precedes periductal-, flat-, and nodular-infiltrating CCAs, whereas intraductal papillary neoplasm of the bile duct (IPNB) precedes the intraductal-growth and papillary type of CCAs. IPNBs are heterogeneous in their histological and pathological profiles along the biliary tree. Hepatobiliary cystadenomas/adenocarcinomas are reclassified as cystic IPNBs and hepatic mucinous cystic neoplasms. Peribiliary glands may participate in the development of CCAs. These latest findings present a new challenge for understanding the pathology of CCAs. |
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Keywords: | Biliary tree cholangiocarcinoma intraductal papillary neoplasm intraductal tubular neoplasm of bile duct intraepithelial biliary neoplasia intraepithelial spread mucinous cystic neoplasm peribiliary glands |
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