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Related Experiment Video

Updated: Oct 25, 2025

Laparoscopic Choledochal Cyst Excision and Roux-en-Y Choledochojejunostomy in Adults
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A New Variant of Choledochal Cyst-Type 6B.

Sugumaran K1, Hirdaya H Nag1

  • 1Surgical Gastroenterology, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research, New Delhi, IND.

Cureus
|August 11, 2021
PubMed
Summary

Type 6 choledochal cysts involving the cystic duct are rare. This study highlights the need to classify combined cystic duct and common bile duct dilatations, proposing subtypes A and B for Type 6 choledochal cysts.

Keywords:
cdccholedochal cystcholedochal cyst type 1dcholedochal cyst type 6bcystic duct dilatation

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Area of Science:

  • Hepatobiliary surgery
  • Gastroenterology
  • Pediatric surgery

Background:

  • Choledochal cysts (CDCs) are congenital biliary malformations.
  • Type 6 CDC, involving the cystic duct, is exceptionally rare.
  • Existing classifications may not fully encompass all presentations.

Observation:

  • A 38-year-old woman presented with upper abdominal pain, initially diagnosed as Type 1a CDC.
  • Intraoperative findings revealed concurrent dilatation of the common bile duct and cystic duct.
  • A 23-year-old female presented with isolated cystic duct dilatation (Type 6A).

Findings:

  • The study identified a rare variant of Type 6 choledochal cyst with combined common bile duct and cystic duct dilatation.
  • This specific presentation is not explicitly defined in the current Todani classification.
  • Proposed extensions suggest Type 1D or 6B for combined dilatation and Type 6A for isolated cystic duct dilatation.

Implications:

  • Accurate classification of choledochal cysts is crucial for appropriate surgical management.
  • The proposed subtypes (6A and 6B) may refine treatment strategies for Type 6 CDCs.
  • Further research and consensus are needed to update the Todani classification for these rare biliary anomalies.