Can be found in intrahepatic or extrahepatic ducts and range in size from a few mm (most common) to a few cm
Tumors may secrete mucin: Wide-open ampulla of Vater with extrusion of mucoid material on ERCP
•
CT and MR: Biliary ductal dilatation due to obstruction &/or increased mucin production
Hypodense, nonenhancing intraductal mass on CECT
T1 hypointense, mildly T2 hyperintense on MR
Multiple round or oval signal voids within dilated ducts on MRCP with serrated appearance of duct wall
•
US: Polypoid nodules
without acoustic shadowing
TOP DIFFERENTIAL DIAGNOSES
•
Choledocholithiasis, cholangiocarcinoma, pneumobilia, hepatocellular carcinoma
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Diagnostic Imaging_ Gastrointes - Michael P Federle
