Hepatic Segmental Anatomy: Couinaud Resection Planner

The liver is functionally divided into eight Couinaud segments, each with its own portal vein, hepatic artery and bile duct inflow and its own hepatic vein outflow — the anatomical basis for planning a liver resection. This simulator renders a stylized 3D liver split into segments I-VIII with their portal and hepatic venous territories, lets you load standard resection plans (right hepatectomy, left hepatectomy, extended right trisectionectomy, left lateral sectionectomy) or build a custom plan by toggling individual segments, and tracks the resulting Future Liver Remnant percentage against the ~25-30% safety floor surgeons use to avoid post-hepatectomy liver failure.