Double duct sign of cholangiopancreatography

What is the double duct sign of cholangiopancreatography? 

A stricture or complete obstruction of the intrapancreatic common bile duct and another stricture or complete obstruction of the main pancreatic duct nearby constitute the double duct sign. The most common malignant cause is adenocarcinoma of the pancreatic head; cholangiocarcinoma, lymphoma, and metastasis are occasional causes. The most common benign cause is chronic pancreatitis

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