What are type I choledochal cysts?

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

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.


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