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In page Ascariasis:

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Bowel obstruction may occur in up to 0.2 per 1000 per year.[1] A worm may block the ampulla of Vater, or go into the main pancreatic duct, resulting in acute pancreatitis with raised serum levels of amylase and lipase. Occasionally, a worm can travel through the biliary tree and even into the gallbladder, causing acute cholangitis or acute cholecystitis.[2][citation needed]