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How great is the incidence of truly congenital common bile duct dilatation?
Y Yamashiro1, M Sato, T Shimizu
1Department of Pediatrics, Juntendo University School of Medicine, Tokyo, Japan.
Insights
This study investigated common bile duct dilatation (CBDD) in children. Findings suggest at least one-third of CBDD cases are congenital, with others being acquired or mixed.
Area of Science:
- Pediatric Gastroenterology
- Hepatobiliary Surgery
- Congenital Anomalies
Background:
- Common bile duct dilatation (CBDD) is a condition requiring etiological investigation.
- Anomalous choledochopancreaticoductal junction (ACP-DJ) is a suspected cause of acquired CBDD due to pancreatic enzyme activation.
- Differentiating congenital from acquired causes is crucial for appropriate management.
Purpose of the Study:
- To investigate the causes of common bile duct dilatation (CBDD) in pediatric patients.
- To assess the role of pancreatic enzyme activity in bile as an indicator of CBDD etiology.
- To differentiate between congenital and acquired causes of CBDD.
Main Methods:
- Bile was aspirated from the dilated common bile duct during laparotomy in 24 children with CBDD.
- Activity of pancreatic enzymes, including trypsin, amylase, and lipase, was measured in the aspirated bile.
- Clinical data, including age and presence of anomalous choledochopancreaticoductal junction (ACP-DJ), were analyzed.
Main Results:
- Activated pancreatic enzymes were found in 14 cases (58.3%), suggesting an acquired component or ACP-DJ.
- No significant enzyme activation (except amylase and lipase) was observed in 10 cases (41.7%).
- Eight of these 10 patients (33.3% of total) were infants under 2 months with intrahepatic duct anomalies, strongly suggesting congenital CBDD.
Conclusions:
- At least one-third of pediatric CBDD cases appear to be congenital, evidenced by enzyme inactivity and associated intrahepatic duct anomalies in infants.
- The remaining CBDD cases may be acquired, congenital, or a combination of both.
- Pancreatic enzyme analysis in bile can aid in distinguishing CBDD etiologies.
Abstract:
In an attempt to investigate the causes of common bile duct dilatation (CBDD), activity of the pancreatic enzymes in bile aspirated from the dilated duct during laparotomy was measured in 24 children with CBDD. The reasoning behind this is the fact that the existence of activated pancreatic enzymes, namely raised activity of all enzymes accompanied by trypsin activation, can be regarded as an acquired result of an anomalous choledochopancreaticoductal junction (ACP-DJ). All of the pancreatic enzymes measured were activated in 14 cases (58.3%) but no evidence of activation of enzymes, such as trypsin or others except for amylase and lipase, was observed in the remaining 10 cases (41.7%), whether an ACPDJ was present or absent. Eight of the 10 patients with no enzyme activation (33.3% of the total) were less than 2 months old. The findings in these eight infants, which included cystic dilation or hypoplasia of the intrahepatic duct, provide strong suggestive evidence of the congenital nature of these cases. These results suggest that at least one third of CBDD cases are congenital and the remaining cases are either acquired or a combination of congenital and acquired, or both.