What best describes what a Couinaud segment contains?

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Couinaud segments are independent functional units of the liver each organized around its own portal triad and biliary drainage. In practice, this means a segment is supplied by its own branch of the portal vein and its own branch of the hepatic artery, and it has its own bile duct carrying bile from that segment. The venous drainage from the segment flows through a segmental hepatic vein to the inferior vena cava, which helps maintain the segment’s functional independence from its neighbors. So the description that best fits a Couinaud segment is that it contains its own portal vein branch, hepatic artery branch, and bile duct. The idea of a shared portal vein or lacking these components doesn’t align with the segmental anatomy.