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The author neglected a pretty matter question: not all cystic ducts implant to EHBD, some cystic ducts implant to left hepatic duct (LHD) or right hepatic duct (RHD). To the Editor: We are grateful for the opportunity to read the article by RENZULLI M et al. entitled, "A New Quantitative Classification of the Extrahepatic Biliary Tract Related to Cystic Duct Implantation." The CDDP is the length of the common bile duct (CBD); the EHBD is the sum of the length of CHD and common hepatic duct (CHD). [Extracted from the article]