Merck Manual

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What Are Gallstones?
What Are Gallstones?
What Are Gallstones?

Gallstones are usually composed of cholesterol that has crystallized from bile. They form in the gallbladder or in the bile ducts. They may leave the gallbladder and lodge in the cystic duct, the common bile duct, or the ampulla of Vater.

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Gallstones