A 48-year-old man with chronic alcohol use disorder is found to have cirrhosis on imaging. Which single histopathological feature best distinguishes alcoholic cirrhosis from cirrhosis due to chronic hepatitis C?

Explanation

## Distinguishing Alcoholic Cirrhosis from Hepatitis C Cirrhosis ### Morphological Features of Cirrhosis by Etiology | Feature | Alcoholic Cirrhosis | Hepatitis C Cirrhosis | |---------|-------------------|----------------------| | **Fibrosis pattern** | Perivenular/pericellular (zone 3) | Portal-based, bridging | | **Steatosis** | Prominent | Minimal to absent | | **Mallory-Denk bodies** | Present | Absent | | **Inflammation** | Mild in cirrhotic stage | Marked portal inflammation | | **Lymphoid aggregates** | Absent | Present (B-cell follicles) | | **Bile duct changes** | Minimal | Proliferation common | | **Nodule size** | Micronodular (< 3 mm) | Mixed micro- and macronodular | **Key Point:** Even in the cirrhotic stage, alcoholic liver disease retains its **distinctive perivenular fibrosis pattern, steatosis, and Mallory-Denk bodies**. These features persist and allow etiology-specific diagnosis even after cirrhosis develops. ### Perivenular (Zone 3) Fibrosis in Alcoholic Disease **High-Yield:** Alcoholic cirrhosis characteristically shows: 1. **Perivenular fibrosis** — collagen deposition around the central vein (zone 3) 2. **Pericellular fibrosis** — "chicken-wire" pattern around individual hepatocytes 3. **Micronodular cirrhosis** — nodules < 3 mm (due to the zone 3 injury pattern) This contrasts with HCV cirrhosis, where fibrosis bridges portal tracts (portal-based pattern). ### Steatosis and Mallory-Denk Bodies in Cirrhotic Stage **Clinical Pearl:** A common misconception is that steatosis and Mallory bodies disappear once cirrhosis develops. In fact: - **Alcoholic cirrhosis retains hepatic steatosis** (often prominent) - **Mallory-Denk bodies persist** in residual hepatocytes - These features are **pathognomonic clues to alcohol etiology** even in advanced disease In HCV cirrhosis, steatosis is usually absent or minimal, and Mallory bodies are not present. ### Why Hepatitis C Cirrhosis Looks Different **Mnemonic: "PLAB" for HCV Cirrhosis** — **P**ortal-based fibrosis, **L**ymphoid aggregates, **A**bsent steatosis, **B**ile duct proliferation HCV causes: - Portal inflammation with lymphoid follicles (B-cell aggregates) - Portal-to-portal and portal-to-central bridging fibrosis - Bile duct proliferation and damage - Minimal steatosis (unless metabolic factors present) ### Cirrhosis Classification by Nodule Size ```mermaid graph TD A[Cirrhosis]:::outcome --> B{Nodule size?}:::decision B -->|Micronodular < 3 mm| C[Alcoholic, HBV, biliary]:::outcome B -->|Macronodular > 3 mm| D[HCV, autoimmune, hemochromatosis]:::outcome C --> E[Perivenular fibrosis pattern]:::outcome D --> F[Portal-based fibrosis pattern]:::outcome ``` **Key Point:** While nodule size is not absolute, micronodular cirrhosis with perivenular fibrosis is the classic pattern of alcoholic disease. [cite:Robbins 10e Ch 18]