## Pathognomonic Histology of Alcoholic Liver Disease **Key Point:** Mallory-Denk bodies (also called Mallory hyaline) are the hallmark histological lesion of alcoholic liver disease, though not absolutely specific to alcohol. ### Composition and Appearance - Aggregates of hyperphosphorylated ubiquitin and α-tubulin - Appear as irregular, eosinophilic, rope-like or rope-twisted inclusions within hepatocytes - Stain with PAS (periodic acid-Schiff) and are diastase-resistant - Best visualized with Masson trichrome stain (appear as blue-green) ### Clinical Significance **High-Yield:** While Mallory-Denk bodies are characteristic of alcoholic liver disease, they are NOT pathognomonic — they can also be seen in: - Non-alcoholic fatty liver disease (NAFLD) - Wilson disease - Primary biliary cholangitis (PBC) - Hepatocellular carcinoma ### Associated Findings in Alcoholic Liver Disease - Hepatic steatosis (macrovesicular) - Neutrophilic infiltration around Mallory bodies - Hepatocellular necrosis - Cirrhosis (in advanced stages) - Fibrosis in portal tracts **Clinical Pearl:** The presence of Mallory bodies + hepatocellular necrosis + neutrophilic infiltration = alcoholic hepatitis, which carries significant morbidity and mortality. ## Why Mallory-Denk Bodies Matter - Indicate chronic ethanol exposure and hepatocellular injury - Correlate with disease severity - Help distinguish alcoholic from non-alcoholic liver disease (though not absolutely) - Presence suggests need for alcohol cessation counseling and supportive care 
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