Choledochal cyst - type IV

Case contributed by Dr Wael Nemattalla


Jaundice and vague upper abdominal pains.

Patient Data

Age: 10 years
Gender: Male

Case Discussion

Choledochal cysts are congenital conditions associated with benign cystic dilatation of bile ducts. They are uncommon in western countries but not as rare in East Asian nations like Japan and China.

They were classified into 5 types by Todani in 1977.

The classification was based on the site of the cyst or dilatation.

  • Type I: most common variety involving saccular or fusiform dilatation of a portion or entire common bile duct (CBD) with normal intrahepatic bile ducts
  • Type II: isolated diverticulum protruding from the CBD
  • Type III or choledochocele: arise from dilatation of duodenal portion of CBD or where the pancreatic duct meets
  • Type IV: dilatation of both intrahepatic and extrahepatic biliary ducts
  • Type V or Caroli disease: cystic dilatation of intrahepatic biliary ducts
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Case information

rID: 7554
Published: 9th Nov 2009
Last edited: 13th Aug 2019
Inclusion in quiz mode: Included

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