Summary of stages[edit]
• Stage 1 — Portal Stage: Normal sized triads; portal inflammation, subtle bile duct damage. Granulomas are often detected in this stage.
• Stage 2 — Periportal Stage: Enlarged triads; periportal fibrosis and/or inflammation. Typically characterized by the finding of a proliferation of small bile ducts.
• Stage 3 — Septal Stage: Active and/or passive fibrous septa.
• Stage 4 — Biliary Cirrhosis: Nodules present; garland or jigsaw puzzle pattern.