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Biliary sludge

Biliary sludge is a deposit of tiny stones or crystals made up of cholesterol (a type of fat), calcium bilirubinate, and other calcium salts. Some doctors refer to biliary sludge as microlithiasis, pseudolithiasis, or biliary sand.

The relationship between biliary sludge and gallbladder symptoms is not well understood. Most people who have biliary sludge do not develop any symptoms. And the sludge usually disappears on its own. Only a small number of people who have biliary sludge develop gallstones.

Current as of: May 1, 2026

Author: WebMD Ignite Staff

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