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Congenital choledochal dilatation with emphasis on pathophysiology of the biliary tract
N Iwai1, J Yanagihara, K Tokiwa
1Division of Surgery, Children's Research Hospital, Kyoto Prefectural University of Medicine, Japan.
Insights
Congenital choledochal dilatation often involves an abnormal pancreaticobiliary junction, leading to pancreatic juice reflux. This reflux may contribute to biliary tract inflammation and, potentially, cancer development.
Area of Science:
- Gastroenterology
- Pediatric Surgery
- Hepatobiliary Surgery
Background:
- Congenital choledochal dilatation is a rare biliary tract malformation.
- The abnormal pancreaticobiliary junction is a key feature.
- Understanding its pathophysiology is crucial for patient outcomes.
Purpose of the Study:
- To investigate the morphologic abnormalities and pathophysiology of the biliary tract in patients with congenital choledochal dilatation.
- To assess the relationship between the abnormal pancreaticobiliary junction and biliary tract inflammation.
- To explore the potential role of pancreatic juice reflux in carcinogenesis.
Main Methods:
- Retrospective analysis of 37 patients with congenital choledochal dilatation who underwent Roux-en-Y hepaticojejunostomy.
- Morphologic evaluation of the choledochopancreaticoductal junction in 26 analyzed patients.
- Measurement of amylase levels in the choledochal cyst and gallbladder.
- Intraoperative biliary manometry to assess pancreatic juice reflux.
Main Results:
- 96.2% of analyzed patients (25/26) exhibited an abnormal pancreaticobiliary junction.
- Elevated amylase levels were observed in the choledochal cyst and gallbladder, irrespective of dilatation type.
- One case of adenocarcinoma was identified in a cystic choledochal dilatation.
Conclusions:
- An abnormal pancreaticobiliary junction is highly prevalent in congenital choledochal dilatation.
- Pancreatic juice reflux into the biliary tract is a significant finding, potentially causing chronic inflammation.
- This chronic inflammation may be a contributing factor to biliary tract cancer development in affected children.
Abstract:
Of 37 patients with congenital choledochal dilatation, aged 8 days to 12 years, who had undergone excision with Roux-en-Y hepaticojejunostomy, 26 patients could be analyzed for morphologic abnormalities and pathophysiology of the biliary tract. Of the 26 patients with congenital choledochal dilatation, 25 (96.2%) had an abnormal choledochopancreaticoductal junction. Of the 12 patients with cystic-type choledochal dilatation, 10 had the C-P type of abnormal choledochopancreaticoductal junction, and of the 13 patients with fusiform-type choledochal dilatation, nine had the P-C type. The amylase levels in the choledochal cyst and the gallbladder were elevated regardless of the form of choledochal dilatation. An adenocarcinoma in a cystic choledochal dilatation was found in one child. Therefore, longstanding inflammation of the biliary tract caused by the reflux of pancreatic juice might be one of the factors in carcinogenesis in the biliary tract. This free reflux of pancreatic juice was demonstrated not only by amylase levels in the biliary tract but also by intraoperative biliary manometry. This reflux might be explained by the lack of sphincter function at the junction of the common bile and pancreatic ducts.