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Venous drainage of extrahepatic bile ducts (Posterior view). The 6 o'clock marginal vein on the posterior surface of the bile duct is present only in few cases. Cystic vein joins 9 o'clock marginal vein. PV = Portal vein; RPV = Right portal vein; LPV = Left portal vein; RHD = Right hepatic duct; LHD = Left hepatic duct; RGV = Right gastric vein.
