Risk factors for postoperative stone formation in pediatric choledochal cysts: a study of 457 cases

Area of Science:

• Pediatric Surgery
• Gastroenterology
• Biliary Tract Diseases

Background:

• Choledochal cysts (CCs) are congenital biliary dilatations.
• Postoperative bile duct stones (intrahepatic bile duct [IHD] and remnant distal common bile duct/common channel duct [RIPD/CCD] stones) are known long-term complications following CC excision.
• Understanding risk factors and outcomes is crucial for managing these pediatric patients.

Purpose of the Study:

• To retrospectively review the occurrence, associated factors, and treatment of postoperative bile duct stones after choledochal cyst excision in pediatric patients.
• To identify specific cyst types and surgical factors linked to stone formation.
• To emphasize the need for long-term surveillance.

Main Methods:

• Retrospective review of 457 pediatric patients who underwent CC excision between 1992 and 2021.
• Analysis of patient records for cholelithiasis, operative details, and clinical outcomes.
• Stratification of stone types (IHD vs. RIPD/CCD) and correlation with cyst characteristics and surgical timing.

Main Results:

• 21 patients developed IHD stones, primarily associated with Todani type IVa cysts (Tsuchida types 2 or 3), linked to IHD dilation and stenosis.
• 18 patients developed RIPD/CCD stones, all associated with complicated Komi types; pancreas divisum impact was unclear.
• Early surgery (<6 months) correlated with a reduced risk of IHD stones but not RIPD/CCD stones.

Conclusions:

• The structural characteristics of the bile duct significantly influence postoperative stone formation after CC excision.
• Specific cyst subtypes (Todani IVa, Tsuchida 2/3) and complicated Komi types are associated with different stone locations.
• Systematic, long-term follow-up is essential for pediatric patients who have undergone CC excision to monitor for and manage bile duct stone development.