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Gall stones are of 3 types 1.Pure cholestrol stones-forming 10% of gall stones. 2.Mixed stones- composed of cholestrol , bile pigments and calcium accounting for 90% of gall stones. 3.Pigment stones. Risk factors for cholestrol stones include: 1.female gender 2.obesity 3.exogenous estrogens 4.increasing age(mostly above 40) 5.diabetes 6.pregnancy 7.rapid weight loss. risk factors for pigment stones: 1.hemolytic anemias 2.ileal resection or disease 3.biliary tract infection 4.bile stasis. The cholestrol stones develop when the bile is supersaturated with cholestrol as compared to bile salts...