Type 1 and type 4b choledochal cyst both are extrahepatic dilation of CBD

what is difference between type 1 and type 4b choledochal cyst both are extrahepatic dilation of CBD

Type 1 is a single solaria ton of the chd

Type 4b is multiple dilatation involving the entire extra hepatic tree

Type 1 is a single fusiform dilatation

Type4b multiple extra hepatic cysts