A 52-year-old man with alcohol-related cirrhosis presents with ascites and portal hypertension. Which single histological feature best distinguishes alcoholic cirrhosis from viral hepatitis-induced cirrhosis?

Explanation

## Distinguishing Alcoholic from Viral Hepatitis Cirrhosis ### Key Histological Discriminator **Key Point:** Mallory-Denk bodies (also called Mallory hyaline) are the pathognomonic hallmark of alcoholic liver disease and are rarely seen in viral hepatitis-induced cirrhosis. ### Comparative Histology | Feature | Alcoholic Cirrhosis | Viral Hepatitis Cirrhosis | |---------|-------------------|-------------------------| | **Mallory-Denk bodies** | Present (characteristic) | Absent or rare | | **Steatosis** | Prominent (microvesicular) | Minimal to absent | | **Neutrophilic infiltration** | Around Mallory bodies | Lymphocytic predominance | | **Bridging fibrosis** | Present in both | Present in both | | **Regenerative nodules** | Present in both | Present in both | | **Portal inflammation** | Mild to moderate | Often moderate to severe | ### Composition of Mallory-Denk Bodies **High-Yield:** Mallory-Denk bodies are composed of: 1. Hyperphosphorylated ubiquitin 2. Keratins 8 and 18 3. Heat shock proteins They appear as: - Eosinophilic, rope-like or irregular inclusions - Stain with orcein, PAS, and immunohistochemistry for ubiquitin - Located in the cytoplasm of hepatocytes ### Clinical Correlations **Clinical Pearl:** While Mallory-Denk bodies are most characteristic of alcoholic liver disease, they can occasionally be seen in: - Non-alcoholic fatty liver disease (NAFLD) - Wilson disease - Primary biliary cholangitis (PBC) - Hepatitis C (rarely) However, in the context of comparing alcoholic cirrhosis to viral hepatitis cirrhosis, Mallory-Denk bodies remain the single best discriminator. ### Why Other Features Are Non-Discriminatory - **Bridging fibrosis and regenerative nodules:** Present in both conditions as part of cirrhotic architecture - **Lymphocytic infiltration:** More prominent in viral hepatitis but can occur in alcoholic disease - **Steatosis:** While more common in alcoholic disease, it is not a cirrhosis-defining feature and may regress [cite:Robbins 10e Ch 18]