Figures 8, 9. Papillary variant of Klatskin tumor. (8) Sagittal US scan through the common hepatic duct shows an oval, well-defined, soft-tissue intraductal mass filling the lumen and "poking" upward into the right main duct (arrow). (9a) Subcostal oblique US scan through the right (RT) and left (L) hepatic ducts shows nodular intraductal tumor filling both ducts. pv = portal vein. (9b) Endoscopic retrograde cholangiopancreatogram also demonstrates tumoral invasion of both hepatic ducts (arrowheads).