pigment gallstone

pigment gallstone
a gallstone whose major component is a bile pigment. Black stones, usually found in the gallbladder, are composed of calcium bilirubinate or pigment polymers, with or without calcium carbonate, calcium phosphate, and mucin; they are hard and often have spicules on the surface. Brown stones, usually found in the common bile duct, are not as hard as black ones, and are composed of calcium bilirubinate and calcium salts of fatty acids, as well as more cholesterol than black ones have.

Medical dictionary. 2011.

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