Nucleation is the initial stage of stone formation in which molecules or particles aggregate to form a crystal nucleus around which additional material precipitates to build a stone. For gallstone formation, nucleation depends on supersaturation of bile with cholesterol and the presence of nucleating factors like mucus-secreting gallbladder epithelial cells. In kidney stone disease, nucleation occurs when ions in urine become supersaturated with respect to mineral composition, allowing stone crystallization to begin. Factors promoting nucleation include dehydration, urinary pH abnormalities, and presence of inhibitors or promoters of crystallization. Understanding nucleation helps explain how different factors contribute to stone formation and guides prevention strategies such as hydration and dietary modifications.
Sonography Term