The Scheuer staging system for primary biliary cholangitis

Stage	Definition
1	Florid duct lesions (chronic nonsuppurative destructive cholangitis)
2	Proliferation of bile ductules
3	Fibrosis or scarring
4	Cirrhosis

Source: Scheuer P. Primary biliary cirrhosis. Proc R Soc Med 1967; 60:1257.

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