A 52-year-old man with a 20-year history of heavy alcohol consumption presents with jaundice, ascites, and hepatic encephalopathy. On histology, the liver shows hepatocyte necrosis, inflammation, and fibrosis. What is the most common pattern of liver fibrosis seen in alcoholic liver disease?

Explanation

## Fibrosis Pattern in Alcoholic Liver Disease **Key Point:** Pericentral (centrilobular) fibrosis is the hallmark and most common pattern of fibrosis in alcoholic liver disease, distinguishing it from other chronic liver diseases. ### Pathophysiology of Pericentral Fibrosis In alcoholic liver disease, the zone of maximal metabolic injury and oxidative stress is **Zone 3 (centrilobular zone)** — the area around the hepatic venule. This zone is: 1. **Most metabolically active** — highest concentration of cytochrome P450 enzymes (CYP2E1) 2. **Most hypoxic** — furthest from the portal blood supply 3. **Most vulnerable to acetaldehyde toxicity** — the toxic metabolite of ethanol This leads to: - Hepatocyte necrosis in Zone 3 - Activation of hepatic stellate cells (myofibroblasts) - Collagen deposition around the central vein - Progressive pericentral fibrosis ### Progression to Cirrhosis As fibrosis advances, pericentral fibrosis bridges to adjacent pericentral zones, eventually creating a **micronodular cirrhosis** pattern (nodules <3 mm). However, the initiating and most common pattern remains pericentral. ### Comparison with Other Liver Diseases | Disease | Fibrosis Pattern | Zone Affected | |---------|------------------|---------------| | **Alcoholic liver disease** | Pericentral (centrilobular) | Zone 3 | | Viral hepatitis (HBV, HCV) | Periportal → bridging | Zone 1 | | Biliary cirrhosis (PBC, PSC) | Periportal | Zone 1 | | Hemochromatosis | Periportal | Zone 1 | | NAFLD | Pericentral (similar to alcohol) | Zone 3 | **Clinical Pearl:** The pericentral pattern in alcoholic liver disease is so characteristic that it helps differentiate alcoholic cirrhosis from other causes. When you see centrilobular fibrosis with steatosis and Mallory-Denk bodies, alcoholic liver disease is the diagnosis. **High-Yield:** Pericentral fibrosis → bridging fibrosis → micronodular cirrhosis is the natural progression in alcoholic liver disease. The pericentral pattern is the earliest and most common finding. [cite:Robbins 10e Ch 18]