The left functional lobe includes everything to which side of the plane through the gallbladder fossa and IVC?

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This question hinges on how the liver is functionally divided, not just by its external anatomy. The Cantlie line defines a plane from the gallbladder fossa to the inferior vena cava. This plane separates the liver into a functional left lobe and a functional right lobe based on how the liver’s blood inflow and outflow are distributed. Everything lying to the left of that plane belongs to the functional left lobe. So the left functional lobe includes structures on the left side of this gallbladder fossa–IVC plane.