Which additional structure is a landmark of the left intersegmental fissure?

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The left intersegmental fissure is a groove on the visceral surface that helps delineate the left liver segments, and its defining landmark is the ligamentum teres. The ligamentum teres runs in the fissure for the ligamentum teres, a remnant of the umbilical vein, making it the clearest internal marker for this fissure. The falciform ligament sits on the liver’s anterior surface and marks a superficial boundary between left and right lobes, not the internal fissure itself. The left hepatic vein lies posterior to the left lobe and drains toward the IVC, not serving as a fissure landmark. The ascending left portal vein is part of the left portal triad but does not define the left intersegmental fissure.