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Gall Bladder Surgery > What is a Gallstone and how is it formed?

Gall stones are formed in the gallbladder and vary in size, shape and colour. Some gall stones contain a large amount of cholesterol and these stones tend to be yellowish in colour. Others are dark green or black in colour and these are pigment-type gall stones.

A Gallstone is created by firstly from the liver which manufactures bile which travels down the bile duct. Some of the bile is then directed into the gallbladder and concentrated. In susceptible people, the concentration of bile triggers the formation of crystals that slowly grow to form gall stones. This process usually occurs over a number of years, but can occasionally occur quite suddenly such as during rapid weight loss.

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