[The composition and structure of cholesterol biliary calculi].

The order and composition of the various elements that are present in the cholesterol stones has been analyzed and a useful model that should help in the study of already formed stones is proposed and therefore a better understanding of the lithogenesis and the physiopathological conditions in which stones develop. The existing components are described from the core up to the crust, case emphasizing the heterogeneity of the core, the calcium palmitate around it and the cholesterol disposition. The various forms of presentation of calcium carbonate are defined as well as the different types of ooliths.