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Common bile duct in children: sonographic dimensions
M Hernanz-Schulman1, M M Ambrosino, P C Freeman
1Department of Pediatric Radiology, Vanderbilt Children's Hospital, Vanderbilt University Medical Center, Nashville, TN 37232.
Insights
The pediatric common bile duct measures under 3.3 mm and grows slowly, similar to the hepatic artery. This distensible duct responds to bile flow changes.
Area of Science:
- Pediatric Radiology
- Gastroenterology
- Biliary System Anatomy
Background:
- Normal pediatric biliary duct dimensions are not well-established.
- Understanding pediatric common bile duct (CBD) caliber is crucial for diagnosing biliary abnormalities.
Purpose of the Study:
- To establish normal caliber and growth rate of the extrahepatic biliary ducts in children.
- To compare pediatric CBD dimensions with other pediatric vascular structures.
Main Methods:
- Sonographic measurement of the CBD diameter in 173 children (1 day to 13 years).
- Regression analysis to determine growth rate, compared to hepatic artery and portal vein.
- Evaluation of CBD diameter variations based on gallbladder distension using the Mann-Whitney U test.
Main Results:
- Average pediatric CBD diameter is 1.27 mm +/- 0.67, with a maximum of 3.3 mm.
- CBD growth rate is slow, similar to the hepatic artery and half that of the portal vein.
- Significant difference in CBD diameter observed between distended and contracted gallbladders (P = .02).
Conclusions:
- The pediatric CBD is significantly smaller than adult norms.
- The pediatric CBD is a distensible structure influenced by prandial bile flow.
- These findings provide essential reference data for pediatric biliary imaging.
Purpose:
To determine the normal caliber and rate of growth of the extrahepatic biliary ducts in the pediatric population.
Materials And Methods:
The diameter of the common bile duct was measured with sonography in 173 children aged 1 day to 13 years (mean, 6.0 years; median, 5.0 years) who were examined for reasons other than hepatic or biliary tract disease. Results were subjected to regression analysis and compared with similar measurements of the extrahepatic portal vein and hepatic artery. The size of the gallbladder was subjectively estimated as distended, moderately full, and contracted. Differences in the diameter of the common bile duct in these three groups were evaluated with the Mann-Whitney U test.
Results:
The average diameter of the common bile duct in this population was 1.27 mm +/- 0.67 (< 3.3 mm in all patients and < 1.2 mm in children aged 3 months or less). The slope of the curve describing the growth of the common bile duct was relatively flat, similar to that of the hepatic artery and half that of the portal vein. There was a significant difference in the diameter of the common bile duct between patients with distended gallbladders and those with contracted gallbladder (P = .02).
Conclusion:
The pediatric common bile duct is significantly smaller than adult norms; it is a distensible structure responsive to fluctuations in prandial bile flow.