Linear filling defect on ERCP is characteristic of which of the following :: (A) Bile duct stone, (B) Pancreatic duct stone, (C) Worm in biliary tree, (D) Stricture
Answer is C. Linear filling defect in main CBD is a characteristic feature of BILIARY ASCARIASIS. ERCP is the gold standard but an invasive method. It is used also in the extraction of CBD worms. The worms appear as a hypointense structure within the hyperintense CBD giving linear filling defect on MRCP/ERCP