What are type I choledochal cysts?

Updated: Jul 01, 2020
  • Author: Emily Tommolino, MD; Chief Editor: BS Anand, MD  more...
  • Print

Type I cysts (see image below) are the most common and represent 80-90% of choledochal cysts. They consist of saccular or fusiform dilatations of the common bile duct, which involve either a segment of the duct or the entire duct. They do not involve the intrahepatic bile ducts.

Type I choledochal cyst. Type I choledochal cyst.

Type IA is saccular in configuration and involves either the entire extrahepatic bile duct or the majority of it.

Type IB is saccular and involves a limited segment of the bile duct.

Type IC is more fusiform in configuration and involves most or all of the extrahepatic bile duct.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!