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I J Beckingham
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Gall stones are the most common abdominal reason for admission to hospital in developed countries and account for an important part of healthcare expenditure. Around 5.5 million people have gall stones in the United Kingdom, and over 50 000 cholecystectomies are performed each year.
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Types of gall stone and aetiology |
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Normal bile consists of 70% bile salts (mainly cholic and chenodeoxycholic acids), 22% phospholipids (lecithin), 4% cholesterol, 3% proteins, and 0.3% bilirubin. Cholesterol or cholesterol predominant (mixed) stones account for 80% of all gall stones in the United Kingdom and form when there is supersaturation of bile with cholesterol. Formation of stones is further aided by decreased gallbladder motility. Black pigment stones consist of 70% calcium bilirubinate and are more common in patients with haemolytic diseases (sickle cell anaemia, hereditary spherocytosis, thalassaemia) and cirrhosis.
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Brown pigment stones are uncommon in Britain (accounting for
<5% of stones) and are formed within the intraheptic and extrahepatic bile ducts as well
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