# Cirrhosis Pathology

> Cirrhosis in MBBS Pathology: micronodular versus macronodular, portal hypertension, Child-Pugh score and decompensation precipitants.

- Canonical URL: https://prepelephant.com/topics/mbbs/pathology/cirrhosis-pathology
- Exam / course: MBBS · Subject: Pathology
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Cirrhosis Pathology", PrepElephant, https://prepelephant.com/topics/mbbs/pathology/cirrhosis-pathology

## Direct answer

Diffuse fibrosis dissecting the liver into regenerative nodules, with bridging septa linking portal tracts to each other and to central veins, defines cirrhosis — anatomically distorting the vascular bed so that resistance rises (portal hypertension) and blood bypasses hepatocytes through portosystemic shunts. Alcohol classically gives a micronodular (under 3 mm) liver, chronic viral hepatitis and metabolic disease a macronodular one, though the patterns evolve into each other. Indian aetiology is shifting: alcohol, hepatitis B and hepatitis C now share the stage with metabolic dysfunction-associated steatotic liver disease, rising fastest in urban India alongside the obesity and diabetes epidemic. The complications — variceal bleeding, ascites, encephalopathy, hepatorenal syndrome and hepatocellular carcinoma — are all vascular or synthetic consequences of the distorted architecture.

## What you must remember

- **Definition triad:** diffuse involvement of the whole liver, fibrous septa bridging portal-portal and portal-central, and regenerative nodules of surviving hepatocytes — all three required.
- **Nodular patterns:** micronodular (under 3 mm, alcohol, biliary obstruction) and macronodular (over 3 mm, chronic viral hepatitis, haemochromatosis, Wilson disease); a micronodular liver frequently converts to macronodular over years.
- **Portal hypertension consequences:** oesophageal and gastric varices via the left gastric vein, caput medusae through the recanalised umbilical vein, splenomegaly with hypersplenism, and ascites (portal pressure plus sodium retention and hypoalbuminaemia; serum-ascites albumin gradient above 1.1 g/dL).
- **Portosystemic shunting:** encephalopathy from ammonia-laden blood skipping the liver, with Alzheimer type II astrocytosis in the brain; lactulose acidifies the colon and rifaximin reduces ammonia-producing flora.
- **Synthetic failure markers:** falling albumin and clotting factors with a rising prothrombin time-INR — the measurable half of the Child-Pugh score alongside bilirubin, ascites and encephalopathy (grades A 5-6, B 7-9, C 10-15).
- **Hyperoestrogenism:** spider naevi, palmar erythema, gynaecomastia and testicular atrophy from reduced hepatic metabolism and increased sex hormone-binding globulin.
- **Hepatorenal syndrome:** functional renal vasoconstriction with avid sodium retention (urine sodium low) in the absence of structural kidney disease, precipitated by infections and gastrointestinal bleeding; hepatocellular carcinoma risk accumulates yearly in viral and alcoholic cirrhosis.

## When a compensated cirrhotic decompensates

A 54-year-old with hepatitis B cirrhosis, stable for two years, arrives with increasing abdominal girth, confusion and a fluttering asterixis. The instinct to reach for diuretics comes second; the hunt for a precipitant comes first, because decompensation is usually an event, not a drift. Spontaneous bacterial peritonitis leads the list — hence diagnostic paracentesis on admission, a polymorph count of 250 per microlitre or more mandating cefotaxime. Gastrointestinal bleeding delivers a protein load that tips encephalopathy; constipation, hyponatraemia, diuretic excess, sedatives and urinary sepsis complete the set. Two management details separate the trained from the rote: dietary protein is no longer restricted (sarcopenia worsens outcomes), and lactulose is titrated to two or three soft stools daily with rifaximin added for recurrence. The Child-Pugh score computed at admission, more than any single laboratory value, predicts survival and brackets the transplant conversation.

## What the Child-Pugh score rewards

Five inputs — bilirubin, albumin, INR, ascites and encephalopathy — with no place for transaminases, because aminotransferases measure injury while the score measures function. Two related exam facts: ascites and encephalopathy are graded clinically (absent, slight, moderate), making the score partly subjective, and the MELD score (bilirubin, INR, creatinine) has displaced Child-Pugh for transplant prioritisation while Child-Pugh still predicts variceal bleeding and surgical mortality — a distinction between scoring systems that vivas probe.

## Frequently asked questions

### What three features define cirrhosis histologically?

Diffuse fibrosis with bridging septa connecting portal tracts and central veins, and regenerative nodules of hepatocytes throughout the entire liver.

### How do micronodular and macronodular cirrhosis differ?

Nodules under 3 mm (micronodular, typical of alcohol and biliary disease) versus over 3 mm (macronodular, chronic viral and metabolic disease); patterns interconvert with time.

### Why does cirrhosis cause portosystemic encephalopathy?

Fibrosis and shunting divert ammonia-rich portal blood away from hepatocytes; ammonia crosses into the brain, producing astrocytic swelling and Alzheimer type II change, with asterixis and fluctuating consciousness.

### What are the components of the Child-Pugh score?

Bilirubin, albumin, prothrombin time-INR, ascites and encephalopathy, graded into classes A (5-6), B (7-9) and C (10-15).

### What precipitates spontaneous bacterial peritonitis work-up in ascites?

Every admission with cirrhotic ascites: diagnostic paracentesis with a polymorphonuclear count of 250 or more per microlitre triggers third-generation cephalosporin therapy and albumin.