Which is a landmark of the left intersegmental fissure?

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The left intersegmental fissure is a deep groove on the visceral surface that marks the boundary between left liver segments and is defined by the venous drainage in that area. The left hepatic vein travels within this fissure as it drains segments II and III into the inferior vena cava, making it the most reliable surface landmark for identifying the left intersegmental fissure. In contrast, the falciform ligament and the ligamentum teres lie along the anterior surface and its own fissure, not the intersegmental plane, and the ascending left portal vein is an intrahepatic branch rather than a surface landmark. Hence, the left hepatic vein best identifies the left intersegmental fissure.