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Formation of Gallstones (Cholelithiasis)

The process of gallstone formation is referred to as cholelithiasis. It is generally a slow process, and usually causes no pain or other symptoms. The majority of gallstones are either the cholesterol or mixed type. Gallstones can range in size from a few millimeters to several centimeters in diameter.

Most gallstones are formed from cholesterol. Pigment stones are also very common; they are formed from a brown-colored substance called calcium bilirubinate. Patients can have a mixture of the two gallstone types.

Cholesterol Stones. Although cholesterol makes up only 5% of bile, about three-fourths of the gallstones found in the US population are formed from cholesterol. Cholesterol gallstones typically form in the following way:

* Cholesterol is not very soluble, so in order to remain suspended in fluid it must be transported within clusters of bile salts called micelles. If there is an imbalance between these bile salts and cholesterol, then the bile fluid turns to sludge. This thickened fluid consists of a mucus gel containing cholesterol and calcium bilirubinate.
* If the imbalance worsens, cholesterol crystals form (a condition called supersaturation), which can eventually form gallstones.

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