Types of Gall Stones

Gall stones are found in the following forms:

  • White or mixed (pure or mainly cholesterol): 80% of UK gall stones occur when bile is super-saturated with cholesterol (Fig 1)
  • Brown: <5% in the UK, due to stasis and infection within the biliary tree
  • Black (bile predominant): seen in haemolytic disease (sickle cell, thalassaemia, G6PDHase deficiency and hereditary spherocytosis) and cirrhosis [1]

Learning Bite

Cholesterol gall stones are commonest.