What is the classification of choledochal cysts?

Choledochal Cyst. In: Doherty GM. eds. Quick Answers Surgery. McGraw-Hill; Accessed April 02, 2021. 

  • Type I cysts (fusiform dilation of common bile duct [CBD]) account for 85-90%
  • Type II (true diverticula of CBD) 1-2% of cases
  • Type III (choledochocele—dilation of distal/intramural portion of CBD) < 2% of cases
  • Type IV (multiple cysts involving intrahepatic and extrahepatic ducts) as high as 15% of cases in some series
  • Type V (cystic malformation of intrahepatic ducts) rare
  • 3-5% incidence of carcinoma
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