Common bile duct diameter reference values in patients with gallstone disease across various age-gender groups

Objective . Our goal was to establish common bile duct (CBD) diameter reference levels for abdominal ultrasound and percutaneous transhepatic cholecysto-cholangiography (PTCC) measurements with relevance to age and gender across the cohort of patients with underlying gallbladder disease excluding any intra- or extrahepatic bile ducts lesions. Materials and methods . 251 symptomatic patients with gallbladder disease and no signs of choledocholithiasis or biliary obstruction presenting to Liver and Pancreas Surgery Department, Sklifosovsky Research Institute for Emergency Medicine from January 2019 to June 2023 were reviewed. All the selected subjects underwent transabdominal ultrasound examination of hepato-biliary zone and PTCC. Common bile duct diameter, if not obscured, was measured at its widest visible portion by means of electronic calipers. The relationship between CBD size, age and gender was examined by nonparametric tests across stratified groups. Results . Mean sonographic CBD diameter was as high as 4.99 ± 1.17 mm with no evidence of correlation with age or gender. Mean cholecysto-cholangiography CBD diameter made up 6.49 ± 1.52 mm and reflected a considerable increase with age only: patients under 60 had CBD diameter significantly narrower, then those over 60. Basing upon the 95-percentile, we derived upper reference limit of 6.0 mm for US measurements without age and sex association, and for PTCC measurements regarding distinct age groups (8.0 mm in subjects < 60 years and 9.0 mm in subjects ≥ 60 years). Diameter of common bile duct was substantially higher on cholangiograms versus sonograms. Conclusion . Present study displayed notable common bile duct diameter discrepancies not only between ultrasound and cholangiography measurements, but also throughout age-dependent groups on cholangiograms. We imply those variations to be taken in consideration in case of contrasting various radiological evaluations of common bile duct, and in case of ruling out the diagnosis of choledocholithiasis or bile flow abnormality.