Current status of the biliary tract malformation

Area of Science:

• Gastroenterology and Hepatobiliary Science
• Embryology and Developmental Biology

Background:

• Choledochal cysts (CC) are congenital biliary tract malformations.
• Current understanding of CC etiology often centers on Babbitt's hypothesis involving reflux, damage, and dilatation.
• The forme fruste type of CC presents challenges to existing classifications.

Purpose of the Study:

• To propose "biliary tract malformation" as a more accurate term for choledochal cysts.
• To challenge the universal applicability of the reflux hypothesis in CC causation.
• To present ductal hypertension as a unifying etiological factor for all CC types.

Main Methods:

• Review of embryological and etiological associations of choledochal cysts.
• Critical analysis of Babbitt's reflux hypothesis.
• Evaluation of the ductal hypertension hypothesis, including the forme fruste presentation.

Main Results:

• Reflux is not consistently demonstrable as the causative factor across all choledochal cyst varieties.
• The forme fruste type of choledochal cyst aligns well with the ductal hypertension hypothesis.
• The proposed terminology "biliary tract malformation" better reflects the embryological origins and diverse etiologies.

Conclusions:

• Choledochal cysts are more accurately described as biliary tract malformations.
• Ductal hypertension offers a more comprehensive explanation for the development of choledochal cysts than reflux alone.
• Revisiting the terminology emphasizes the complex etiology and embryological basis of these conditions.