| Type [4] | Description | Johns Hopkins; [2] USA | Northwestern; [5] USA | Hannover; [6] Germany | Kyushu; [7] Japan | Banaras; [8] India |
| Type I (choledochal cyst) | Cystic (a) fusiform (b), or saccular (c) extrahepatic biliary dilatation | 21 (50%) | 14-IA (67%) 7-IB (33%) | 7 (54%) | 26 (57%) | 7 (70%) |
| Type II | Extrahepatic biliary diverticulum | 1 (2%) |
| 1 (8%) | 0 (0%) | 0 (0%) |
| Type III (choledochocele) | Dilatation of extrahepatic intraduodenal libiary tree | 2 (5%) |
| 1 (0%) | 2 (5%) | 0 (0%) |
| Type IV |
| 14 (33%) |
| 2 (15%) | 17 (37%) | 3 (30%) |
| A | Intrahepatic and extrahepatic saccular/cystic dilatation |
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| B | Multiple extrahepatic cysts |
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| Type V (Caroli’s) | Intrahepatic biliary cyst | 4 (10%) |
| 2 (15%) | 1 (2%) | 0 (0%) |