Radiologic appearance of gallstones and its relationship with biliary symptoms and awareness of having gallstones. Observations during epidemiological studies. Rome Group for the Epidemiology and Prevention of Cholelithiasis (GREPCO).

In the course of two cross-sectional epidemiological surveys carried out by the Rome Group for Epidemiology and Prevention of Cholelithiasis (GREPCO), cholecystography was performed in 82 of 126 subjects identified by means of ultrasonography as having gallstones. In four subjects gallstones were not detected by cholecystography. The x-ray characteristics of the gallbladder and gallstones of the remaining 78 subjects were related to age, sex, presence of biliary symptoms in the five years prior to the study, and awareness of having gallstones. Twenty-three of the 78 gallstone subjects (29.5%) showed a nonvisualized gallbladder. Among the 55 subjects with visualized gallbladder, 16 (29.1%) and 28 (50.9%) showed radiopaque and solitary stones, respectively. The mean diameter of the largest stone was 19.7 mm +/- 11.2 (SD). Age was related inversely to the number of stones. X-ray characteristics of gallstones did not differ between men and women. Presence of biliary symptoms in the five years prior to the study or awareness of having gallstones were not related to any radiologic feature, either in univariate or multivariate statistical analysis which included age, sex, weight, and height as possible confounding variables. Nineteen (24.3%) of the 78 subjects showed gallstones which would have been suitable for medical therapy with bile acids (ie, radiolucent, with a diameter of less than 20 mm, and in a visualized gallbladder).