Double duct sign
 Discussion of Double duct sign
- The double duct sign is a finding seen at magnetic resonance (MR) cholangiopancreatography and consists of simultaneous dilatation of the common bile and pancreatic ducts.
- This sign can also be seen with other modalities such as endoscopic retrograde cholangiopancreatography, computed tomography, and ultrasonography.
- The simultaneous dilatation of the common bile duct (in the intrapancreatic segment) and the pancreatic duct occurs with biductal narrowing.
- The narrowing is generally secondary to contiguous obstruction or encasement of the common bile and main pancreatic ducts by a pancreatic head tumor.
- The two most common causes of the double duct sign are carcinoma of the head of the pancreas and carcinoma of the ampulla of Vater.
 Imaging Findings for Double duct sign
 See Also
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 References for Double duct sign
- Jorge Ahualli. The Double Duct Sign. Radiology 2007 244: 314-315.