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Background Farrar’s criteria for cystic duct carcinoma (histopathologic diagnosis of a carcinoma strictly limited to the cystic duct) are impractical especially when making a diagnosis of primary cystic duct carcinoma in its advanced stage. Therefore, in our previous study, we proposed a new definition of cystic duct carcinoma: a gallbladder tumor, the center of which is located in the cystic duct...
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