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Figure 1: CCC classification: type Ia, cystic dilatation of the common bile duct with PBM; type Ib, focal segmental dilatation without PBM; type Ic, fusiform dilatation of the entire extrahepatic bile duct with PBM; type II, diverticular dilation of the common bile duct without PBM; type III, dilatation of the intraduodenal segment of the common bile duct (choledochocele) without PBM; type IVA, combined dilatations of intrahepatic and extrahepatic bile ducts, usually accompanied by PBM; type IVB, multiple dilatations of extrahepatic bile duct, PBM is uncertain; type V, cystic dilatations of the intrahepatic bile ducts (Caroli’s disease) without PBM.