## Why Chronic viral hepatitis B or C is right The structure marked **A** shows coarse macronodules (>3 mm) with broad, irregular fibrous septa — the classic morphologic hallmark of **macronodular (post-necrotic) cirrhosis**. According to Robbins 10e, macronodular cirrhosis is classically seen in post-viral cirrhosis due to chronic hepatitis B or C, as well as alpha-1 antitrypsin deficiency, late-stage primary biliary cholangitis, and end-stage autoimmune hepatitis. The patient's 20-year history of chronic hepatitis C directly correlates with this morphology. The broad, irregular septa result from bridging fibrosis following episodes of hepatocyte necrosis and regeneration in chronic viral infection. ## Why each distractor is wrong - **Chronic alcoholic liver disease**: While alcohol can eventually lead to cirrhosis, the classic morphology in alcoholic cirrhosis is **micronodular** (uniform small nodules <3 mm with thin, uniform septa), not macronodular. Macronodular patterns may develop late in advanced alcoholic disease, but the primary association is with viral hepatitis. - **Hemochromatosis (HFE C282Y)**: Hemochromatosis typically produces **micronodular cirrhosis** with iron deposition in hepatocytes and Kupffer cells, not the macronodular pattern shown in structure **A**. - **Primary biliary cholangitis (early stage)**: Early-stage PBC presents with cholestasis and bile duct destruction but does not produce cirrhosis. Late-stage PBC can lead to macronodular cirrhosis, but the clinical context (chronic hepatitis C) and the acute presentation make viral hepatitis the most appropriate answer. **High-Yield:** Macronodular (post-necrotic) cirrhosis = post-viral hepatitis B/C; micronodular = alcoholic liver disease, hemochromatosis, early biliary cirrhosis. [cite: Robbins and Cotran Pathologic Basis of Disease, 10th ed., Ch. 18 — Liver and Biliary Tract]
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