Figures 29, 30. (29) Metastasis mimicking papillary cholangiocarcinoma of the intrahepatic bile duct. Transverse US scan through the left lobe of the liver shows a papillary intraductal mass (arrow) obstructing a segmental bile duct (s). Metastatic rectal cancer was proved at histopathologic analysis. (30) Metastasis mimicking papillary cholangiocarcinoma of the extrahepatic bile duct. Sagittal US scan through the common bile duct (cbd) shows a polypoid intraluminal mass (m) causing bile duct obstruction. Metastatic melanoma was proved at histopathologic analysis.