Dictionary > Gallstone

Gallstone

Definition
noun, plural: gallstones
A calculus or stone composed of cholesterol and bile salts, forming within the gallbladder or its ducts
Supplement
A gallstone is a calculus (i.e. a hard lump formed by the concretion of mineral salts) found within the gallbladder as well as its ducts. It is formed when bile components accumulate and form like stones. The gallbladder is a hollow organ that serves as storage of bile. Thus, the bile (or gall) is saturated (or concentrated) within the gallbladder and therefore may form calculus called gallstones. The process of calculus formation within the gallbladder is referred to as cholelithiasis. Gallstones form primarily within the gallbladder but they may pass distally into the other parts of the biliary tract. Thus, gallstones may also be found in the cystic duct, pancreatic duct, ampulla of Vater, and common bile duct. Gallstones may also erode the gallbladder fundus and reach the gut lumen. This condition, although rare, may lead to gallstone ileus in which the presence of gallstone may cause obstruction of the distal ileum. Other conditions that are associated with the presence of gallstones within the gallbladder and its ducts are acute cholecystitis, pancreatitis, and ascending cholangitis. The different types of gallstones are cholesterol stones (consists of mainly cholesterol, i.e. 70% or 80% and above), pigment stones (comprised mainly of bilirubin and bile calcium salts), and mixed gallstones (made up of cholesterol, calcium salts, etc.)
Variant(s):

  • gall stone

Synonym(s):

  • bilestone
  • cholelith
  • See also:

    Related term(s):

  • Gallstone colic
  • Gallstone ileus


  • You will also like...

    kinesin motor proteins transporting molecules across microtubules
    Movement of Molecules Across Cell Membranes

    Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

    Freshwater lake ecosystem
    Freshwater Producers and Consumers

    Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..

    Lentic community
    Freshwater Communities & Lentic Waters

    Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

    Peppered moth ("Biston betularia") melanic and light form
    Examples of Natural Selection

    Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..

    Schematic diagram of bacterial lactose operon
    Gene Action – Operon Hypothesis

    Learn how the way genes control and determine every aspect of the body. This lesson uses lac operon as an example. ..

    ..

    Growth and Plant Hormones
    Growth and Plant Hormones

    Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..

    Related Articles...

    No related articles found

    See all Related Topics