Inverted Calot's triangle and associated vascular variations

This report describes the concurrent vascular and ductal variations of the hepatobiliary system. The right hepatic artery arose directly from the common hepatic artery, passed through the Calot's triangle and entered the right lobe of the liver through the gall bladder fossa. The left hepatic artery arose from a common gastrohepatic trunk and entered the left lobe of the liver through fissure for ligamentum venosum. It gave two esophageal branches before entering the liver. The cystic duct was broad, straight and opened on the left side of the common hepatic duct, thus giving a mirror image appearance to the Calot's triangle. This report is likely to be the first on such combined variations at the vicinity of the liver.