title: Technique of right hemihepatectomy preserving ventral right anterior section guided by area of hepatic venous drainage.
abstract: BACKGROUND
  Although the consequences of partial venous outflow interruption have attracted only limited attention in liver surgery, maximal preservation of liver function after hepatic resection requires preservation of circulation in the remnant liver, especially hepatic vein drainage.
  
  
  METHODS
  Data from 30 patients undergoing 3-dimensional imaging were analyzed to clarify the relationship between the area of the ventral right anterior section (RAS) and that drained by regional hepatic vein tributaries. The feasibility of our preliminary technique of right hemihepatectomy preserving the ventral RAS also was evaluated.
  
  
  RESULTS
  The median estimated volume of the ventral RAS was 230 mL (range, 88-391). The average ratio of this estimated volume of the ventral RAS to total estimated liver volume was 18.0 +/- 4.9%. The median volume of the territory served by middle hepatic vein (MHV) tributaries draining the ventral RAS, expressed as a percentage of the whole volume of the ventral RAS, was 82.5%. Findings in fusion images of portal and hepatic vein territories demonstrated an area of MHV tributaries comparable with the ventral RAS area in 73.3% of all cases. As for the results of right hemihepatectomy with the ventral RAS preserved, no tumor was exposed on transection surfaces, and no recurrence took place within the preserved ventral RAS of the remnant liver.
  
  
  CONCLUSIONS
  Procedures considering the importance of regional venous drainage offer the possibility of reducing the extent of surgery without loss of effectiveness.
authors.affiliation: Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan. ktrj112@urahp.yokohama-cu.ac.jp
authors.forename: Kuniya
authors.initials: K
authors.lastname: Tanaka
authors.forename: Chizuru
authors.initials: C
authors.lastname: Matsumoto
authors.forename: Hideki
authors.initials: H
authors.lastname: Takakura
authors.forename: Kenichi
authors.initials: K
authors.lastname: Matsuo
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Nagano
authors.forename: Itaru
authors.initials: I
authors.lastname: Endo
authors.forename: Shinji
authors.initials: S
authors.lastname: Togo
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shimada
authors.forename: Holger
authors.initials: H
authors.lastname: Bourquain
authors.forename: Heinz O
authors.initials: HO
authors.lastname: Peitgen
mesh_terms: D000328:Adult; D000368:Aged; D001810:Blood Volume; D006528:Carcinoma, Hepatocellular / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D015179:Colorectal Neoplasms / Q000473:pathology; D005240:Feasibility Studies; D005260:Female; D006498:Hepatectomy / Q000379:methods*; D006503:Hepatic Veins; D006801:Humans; D021621:Imaging, Three-Dimensional; D008102:Liver Circulation / Q000502:physiology*; D008113:Liver Neoplasms / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D055815:Young Adult