Imaging insights into pediatric liver masses: A comprehensive minireview for hepatology practice

Table 4 Todani classification of choledochal cysts

	Todani classification	Subtypes
Type I	Fusiform dilatation of the extrahepatic biliary ducts	Ia: Dilatation of entire extrahepatic bile duct. Ib: Focal segmental dilatation of extraheptic bile duct. Ic: Dilatation of the common bile duct
Type II	Saccular outpouching from the intra and extrahepatic bile duct, also known as bile duct diverticulum
Type III	Protrusion of a focally dilated intramural segment of the common bile duct into the duodenum, also known as choledochocele
Type IV	Communicating intra and extrahepatic duct cysts	IVa: Dilatation of the entire extrahepatic bile duct along with dilatation of the intrahepatic bile ducts. IVb: Cystic dilatation involving only the extrahepatic bile duct
Type V	Cystic dilatation of intrahepatic bile ducts, also known as Caroli disease
Type VI	Dilatation of only the cystic duct, a rare entity