All of the following are true about Gallstones except
(C) Black stones contain calcium carbonate # Gallstones have different appearance, depending on their contents. On the basis of their contents, gallstones can be subdivided into the two following types:> Cholesterol stones are usually green, but are sometimes white or yellow in color. They are made primarily of cholesterol and account for 80 percent of gallstones. They are radiolucents> Pigment stones are small, dark stones made of bilirubin and calcium salts that are found in bile. They account for 20 percent of gallstones. Risk factors for pigment stones include hemolytic anemia, cirrhosis, biliary tract infections, and hereditary blood cell disorders, such as sickle cell anemia and spherocytosis. They are radio-opaques.> Mixed stones account for the majority of stones. Most of these are a mixture of cholesterol and calcium salts. Because of their calcium content, they can often be visualized radiographically.> seudolithiasis:''Fake stone" Sludge-like gallbladder secretions that act like a stone.
Cholesterol stones are radiolucent
Brown stones in sterile gallbladder
Black stones contain calcium carbonate
Common in non-western population
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