Regarding of the well-documented relationship of overweight and obesity with disorders of the biliary system among adults, in this study the ultrasonographic findings of biliary system were compared in children and adolescents with or without overweight. Materials and Methods: This cross-sectional study was conducted on 372 children and adolescents, aged 6-18 years in Isfahan.They were divided into two groups of normal and overweight , based on their body mass index. Sonographic findings of the biliary system were compared in the both groups. Results: The mean age of participants was 12.6 ± 3.2 years . The mean diameter of biliary ducts was 2.7±1.1mm in the normal-weight group and 3 ± 1.3 mm in high body mass index group. There was a significant correlation between biliary ducts diameter and body mass index (p = 0.04) . There existed a significant direct correlation (0.13)between the age of the samples and biliary ducts diameter (p=0.01) . The gallbladder was normal in all samples . There was no significant correlation between body mass index and gallbladder wall thickness. Conclusion: Early diagnosis of biliary disease which is associated with overweight and obesity in children and adolescents, can prevent from disease progression ,and reduce their future complications.

Keywords: Body mass index, Biliary system, Children and adolescents, Sonography .

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