Structure:

The cystohepatic triangle is an anatomical space located in the right upper quadrant of the abdomen along the inferior surface of the liver within the hepatobiliary region.[1] It lies adjacent to the gallbladder and extrahepatic biliary tree and serves as a key surgical landmark in hepatobiliary procedures.

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In its modern definition, the triangle is bounded medially by the common hepatic duct, inferiorly by the cystic duct, and superiorly by the inferior surface of the liver.[1,2] The contents of the triangle commonly include the cystic artery, lymphatic vessels, autonomic nerve fibres, and the cystic lymph node (node of Lund).[1]

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Considerable anatomical variation exists in this region, particularly in the origin and course

of the cystic artery and right hepatic artery, which may traverse or lie adjacent to the triangle.[2] Given this variability, precise identification of structures within this region is essential during hepatobiliary surgery.

Historically, Jean-François Calot originally described the superior boundary of the triangle as the cystic artery rather than the inferior surface of the liver.[3] Subsequent anatomical clarification revised the superior boundary to the liver margin to improve consistency and reduce ambiguity in surgical practice.[2]

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Important spatial relationships include proximity to the portal triad within the hepatoduodenal ligament and the right hepatic artery posteriorly.[1] These relationships underscore the need for meticulous dissection in this region.