What is the most commonly encountered biliary ductal anatomy?
The left hepatic duct is formed by the union of medial and lateral segment bile ducts. Right hepatic lobe bile duct anatomy is more complex and variable. The posterior-inferior and posterior-superior portions of the right hepatic lobe are drained by the right posterior ducts (also known as the right dorsal caudal ducts). The anterior-inferior and anterior-superior portions of the right hepatic lobe are drained by the right anterior ducts (also known as the right ventral cranial ducts). The right hepatic duct is formed by the union of the right posterior segment duct and right anterior segment duct. The confluence of right and left hepatic ducts forms the common hepatic duct, which is joined by the cystic duct (from the gallbladder) to form the common bile duct. The most common biliary ductal anatomy (in ≈60% of the population) consists of a right posterior segment duct that joins the right anterior segment duct to form the right hepatic duct
