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Patterns of the right hepatic bile duct. (a) A three-dimensional volume-rendering (VR) image (superior oblique view) shows a Type 2 pattern with hilar trifurcation of the right anterior (arrowhead), right posterior (large arrow) and left hepatic (small arrow) ducts. (b) A VR image (posterior view) shows a Type 4 pattern, with aberrant drainage of the right posterior duct into the common hepatic duct (arrows). This case also has Type A cystic duct, as described in Table 3.
