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Variation of right posterior hepatic duct anatomy. (A) Supraportal type with right hepatic duct; type A. (B) Supraportal type without right hepatic duct (trifurcation type); type B. (C) Supraportal type without right hepatic duct (RPHD jointing left hepatic duct type); type C. (D) Infraportal pattern with RHD; type D. (E) Infraportal type without RHD; type E. Other combined types or rare branching types were excluded from this cohort.
