title: Relation between hepatic and portal veins in the right paramedian sector: proposal for anatomical reclassification of the liver.
abstract: Although a right liver graft without a middle hepatic vein resulted in potential venous congestion in the right paramedian sector, the details of the hepatic venous distribution in the right paramedian sector have not been established. In this study, the ramification patterns of the hepatic veins draining the right anterosuperior segment (S8) and the relation between the hepatic and portal veins were assessed using multislice computed tomography in 44 patients without lesions in the liver. All 52 drainage veins of the ventral area of S8 joined the middle hepatic vein, and all 48 drainage veins of the dorsal area joined the right hepatic vein. The hepatic vein crossing between the ventral and dorsal areas was observed in each patient examined. Therefore, we propose a reclassification wherein the right paramedian sector is divided into ventral and dorsal segments. This new classification may contribute to the development of new and safer surgical procedures, including more limited resection and right lobe adult living donor liver transplantation to avoid graft congestion.
authors.affiliation: Department of Academic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, 260-0856 Chuou-ku, Chiba, Japan. acho@faculty.chiba-u.jp
authors.forename: Akihiro
authors.initials: A
authors.lastname: Cho
authors.forename: Shinichi
authors.initials: S
authors.lastname: Okazumi
authors.forename: Harufumi
authors.initials: H
authors.lastname: Makino
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Miura
authors.forename: Gaku
authors.initials: G
authors.lastname: Ohira
authors.forename: Yushin
authors.initials: Y
authors.lastname: Yoshinaga
authors.forename: Takayuki
authors.initials: T
authors.lastname: Toma
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Kudo
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Matsubara
authors.forename: Munemasa
authors.initials: M
authors.lastname: Ryu
authors.forename: Takenori
authors.initials: T
authors.lastname: Ochiai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006503:Hepatic Veins / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D006801:Humans; D008099:Liver / Q000098:blood supply* / Q000000981:diagnostic imaging*; D008875:Middle Aged; D011169:Portal Vein / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed