Spontaneous rupture of a type IVA choledochal cyst in a young adult during radiological imaging

Table 1 Classification of choledochal cysts (after Todani et al[3])

Type		Characteristics
	IA	Dilatation of the common bile duct (CBD), with marked dilatation of part or the entire extrahepatic biliary tree and normal intrahepatic biliary tree
I	IB	Focal and segmental dilatation of the distal CBD
	IC	Fusiform dilatation of the CBD, with diffuse cylindrical dilatation of the common hepatic duct and CBD as well as normal intrahepatic biliary tree
II
		Diverticulum of the CBD
III
		Choledochocele of the intraduodenal portion of the CBD
	IVA
IV		Multiple cysts involving both the intrahepatic and extrahepatic bile ducts
	IVB
		Multiple cysts of the extrahepatic ducts only
V
		Caroli’s disease