Classification of anatomical morphology of cystic duct and its association with gallstone

Figure 2 The classification of intrahepatic bile duct anatomy. A: Type A: The right posterior duct (RPD) (black arrow) converges into the right hepatic duct (yellow arrow); B: Type B: The RPD (black arrow) converges into the junction of the right and left hepatic ducts, and the three show a three-fork type; C: Type C: The RPD (black arrow) converges into the left hepatic duct (blue arrow); D: Type D: The RPD (black arrow) converges into the extrahepatic bile duct.