Effect of the extrahepatic bile duct anatomy on choledocholithiasis and its clinical significance

Figure 1 Cross-section of the bile duct and insertion height of the cystic duct is divided into three equal segments. A: Insertion position of the cystic duct is divided into anterior, posterior, medial, and lateral segments; B: Insertion height of the cystic duct is divided into upper, middle, and lower segments.