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File:Ultrasonography of dilated intrahepatic bile ducts.jpg|Dilated [[Abdominal ultrasonography]] (with Doppler) of dilated intrahepatic bile ducts, in this case because of [[pancreatic cancer]].<ref>{{cite journal|last1=Yoo|first1=Youngsun|last2=Mun|first2=Seongpyo|title=Synchronous double primary squamous cell carcinoma The bile ducts are colorless (black) in contrast to blood vessels (portal vein near center, and adenocarcinoma of hepatic artery to the extrahepatic bile duct: a case report|journal=Journal right of Medical Case Reports|volume=9|issue=1|year=2015|issn=1752-1947|doi=10it) which have Doppler signal.1186/s13256-015-0600-1}}</ref>