Classification for benign biliary strictures
Bismuth classification
I - Low CHD stricture, > 2 cm distal to hilum
II - Proximal CHD stricture, < 2 cm distal do hilum
III - Hilar involvement up to proximal extent of CHD, but confluence preserved
IV - Confluence involved, no communication left and right ducts
V - Type I , II or III plus stricture of an isolated (aberrant) right duct
Strasberg Classification
A - Small duct injury in continuity with biliary system, with cystic duct leak
B - Injury to sectoral duct with consequent obstruction
C - Injury to duct with consequent bile leak from a duct not in continuity with biliary system
D - Injury lateral to extrahepatic ducts
E1 -  Stricture located > 2 cm from bile duct confluence
E2 - Stricture located < 2 cm from bile duct confluence
E3 - Stricture located at bile duct confluence
E4 - Stricture involving right and left bile ducts
E5 - Complete occlusion of all bile ducts

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