FIGURE 3. Confluence patterns of the right intrahepatic bile ducts in 110 cases. Supraportal pattern: Type A, the right posterior sectional bile duct (P) joins the right anterior sectional bile duct (A); Type B, P drains into the confluence of A and left hepatic duct (LHD); and Type C, P enters LHD. Infraportal pattern: Type D, P joins A; Type E, P enters the common hepatic duct. Combined pattern: Type F, some elements of the right posterior sectional bile duct (P1) enter A infraportally and the remaining portion (P2) joins A supraportally; and Type G, P joins the common hepatic duct infraportally and P2 joins LHD supraportally. RHD, right hepatic duct.