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Updated: Aug 19, 2026

A Mouse Model of the Associating Liver Partition and Portal Vein Ligation for Staged Hepatectomy Procedure Aided by Microscopy
Published on: January 19, 2024
Proposal for a reclassification of liver based anatomy on portal ramifications
Akihiro Cho1, Shinichi Okazumi, Yukimasa Miyazawa
1Department of Academic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuou-ku Chiba 260-0856, Japan. acho@sis.seirei.or.jp
Background:
Portal branching patterns that differ from those previously described are occasionally encountered during liver surgery.
Methods:
A total of 60 patients with normal intrahepatic venous anatomy underwent helical computed tomography during arterial portography (CTAP). Next, 3 dimensional portograms were reconstructed to verify the locations of the portal veins. Portal branching patterns in the right hemiliver were assessed.
Results:
In all 60 patients examined, the right anterior portal vein bifurcated into the ventral and dorsal branches. In 42 (70%) of 60 patients, some branches arose from the right posterior portal trunk. Between 1 and 3 branches (mean 2.3 branches per patient) coursed cranially, between 2 and 5 branches (mean 3.2 branches per patient) coursed caudally, and between 1 and 2 branches (mean 1.3 branches per patient) coursed laterally.
Conclusions:
We propose that the right liver should be divided into 3 segments, which are designated as the right anterior, middle, and posterior segments.
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