title: Anatomic variation in intrahepatic bile ducts: an analysis of intraoperative cholangiograms in 300 consecutive donors for living donor liver transplantation.
abstract: OBJECTIVE
  To describe the anatomical variation occurring in intrahepatic bile ducts (IHDs) in terms of their branching patterns, and to determine the frequency of each variation.
  
  
  METHODS
  The study group consisted of 300 consecutive donors for liver transplantation who underwent intraoperative cholangiography. Anatomical variation in IHDs was classified according to the branching pattern of the right anterior and right posterior segmental duct (RASD and RPSD, respectively), and the presence or absence of the first-order branch of the left hepatic duct (LHD), and of an accessory hepatic duct.
  
  
  RESULTS
  The anatomy of the intrahepatic bile ducts was typical in 63% of cases (n=188), showed triple confluence in 10% (n=29), anomalous drainage of the RPSD into the LHD in 11% (n=34), anomalous drainage of the RPSD into the common hepatic duct (CHD) in 6% (n=19), anomalous drainage of the RPSD into the cystic duct in 2% (n=6), drainage of the right hepatic duct (RHD) into the cystic duct (n=1), the presence of an accessory duct leading to the CHD or RHD in 5% (n=16), individual drainage of the LHD into the RHD or CHD in 1% (n=4), and unclassified or complex variation in 1% (n=3).
  
  
  CONCLUSIONS
  The branching pattern of IHDs was atypical in 37% of cases. The two most common variations were drainage of the RPSD into the LHD (11%) and triple confluence of the RASD, RPSD and LHD (10%).
authors.affiliation: Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Songpa-gu, Seoul, Korea.
authors.forename: Jin Woo
authors.initials: JW
authors.lastname: Choi
authors.forename: Tae Kyoung
authors.initials: TK
authors.lastname: Kim
authors.forename: Kyoung Won
authors.initials: KW
authors.lastname: Kim
authors.forename: Ah Young
authors.initials: AY
authors.lastname: Kim
authors.forename: Pyo Nyun
authors.initials: PN
authors.lastname: Kim
authors.forename: Hyun Kwon
authors.initials: HK
authors.lastname: Ha
authors.forename: Moon-Gyu
authors.initials: MG
authors.lastname: Lee
mesh_terms: D001653:Bile Ducts, Intrahepatic / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D002758:Cholangiography; D006801:Humans; D007432:Intraoperative Period; D016031:Liver Transplantation; D019520:Living Donors