Liver Pathology — Hepatitis & Cirrhosis

The liver is a high-yield NEET PG battlefield, dominated by image-interpretation questions: identify the cell, name the inclusion, predict the virus. This note builds the architecture from normal hepatocyte injury through viral and alcoholic hepatitis to end-stage cirrhosis and portal hypertension, with the classic eponymous bodies you must recognise on sight.

Normal architecture & patterns of injury

The functional unit is the hepatic lobule (central vein at centre, portal triads at periphery) versus the acinus of Rappaport (terminal hepatic vein at periphery, portal tract at centre). The acinus is divided into three zones:

Zone	Location	Blood supply	Vulnerable to
Zone 1 (periportal)	Nearest portal triad	Most oxygenated	Yellow phosphorus, viral hepatitis, eclampsia
Zone 2 (mid)	Intermediate	Intermediate	Yellow fever
Zone 3 (centrilobular)	Nearest central vein	Least oxygenated	Ischaemia, paracetamol, CCl₄, alcohol, halothane

High-yield: Zone 3 (centrilobular) is most susceptible to ischaemic and toxic (paracetamol, CCl₄) injury because it is farthest from the oxygenated blood. Zone 1 bears the brunt of viral hepatitis and phosphorus poisoning.

Hepatocyte death occurs in two morphological flavours: ballooning degeneration (cell swelling, clumped cytoplasm — reversible, feathery) and apoptosis, the latter producing the shrunken acidophilic Councilman body.

Acute viral hepatitis — histology

Hepatotropic viruses (A, B, C, D, E) produce a stereotyped pattern of panlobular inflammation:

• Lobular disarray — loss of the normal cord-like architecture due to ballooning, dropout and regeneration.
• Councilman (apoptotic/acidophilic) bodies — shrunken, deeply eosinophilic, anucleate apoptotic hepatocytes. Classic of yellow fever but seen in any acute viral hepatitis.
• Spotty (focal) necrosis with mononuclear (lymphocyte/macrophage) infiltrate.
• Kupffer cell hyperplasia and portal tract lymphocytic inflammation.
• Cholestasis with bile plugs in canaliculi.

High-yield: Councilman body = apoptotic hepatocyte. First described in yellow fever; "acidophil body" is the synonym. It represents apoptosis, NOT necrosis.

Severe forms show bridging necrosis (necrosis spanning portal-to-portal, central-to-central, or portal-to-central) and, at the extreme, massive/submassive necrosis → fulminant hepatic failure.

Hepatitis viruses compared

Feature	HAV	HBV	HCV	HDV	HEV
Genome	ssRNA	dsDNA (partial)	ssRNA	circular ssRNA	ssRNA
Family	Picornavirus	Hepadnavirus	Flavivirus	Deltavirus (defective)	Hepevirus
Transmission	Faeco-oral	Parenteral/sexual/vertical	Parenteral	Parenteral (needs HBV)	Faeco-oral
Chronicity	Never	~5–10% adults, 90% neonates	Up to 80%	If superinfected	Rare (immunosuppressed)
Fulminant	Rare	Yes	Rare	Co/super-infection	Pregnant women (mortality ~20%)
HCC risk	No	Yes (direct + cirrhosis)	Yes (via cirrhosis)	Yes	No

High-yield: HEV in pregnancy (esp. third trimester) carries ~15–25% mortality from fulminant failure. HBV is the only DNA virus of the hepatotropic group and the only one that can cause HCC without cirrhosis (integration of viral DNA, X protein).

HBV-specific morphology — ground-glass hepatocytes

Chronic HBV carriers accumulate HBsAg in the smooth endoplasmic reticulum, giving the cytoplasm a finely granular, glassy, pale eosinophilic appearance — the ground-glass hepatocyte. They stain with:

• Orcein / Victoria blue (highlights HBsAg)
• Shikata's orcein stain
• Immunohistochemistry for HBsAg

High-yield: Ground-glass hepatocytes = chronic HBV (HBsAg in SER). A favourite single-image question. Don't confuse with the diffuse ground-glass of other diseases — in the liver, think HBV. "Sanded nuclei" (HBcAg accumulation) is the nuclear counterpart.

Chronic hepatitis — grading & staging

Chronic hepatitis is inflammation lasting >6 months. The two hallmark lesions:

1. Interface hepatitis (piecemeal necrosis) — inflammation eroding the limiting plate of periportal hepatocytes. Marker of activity.
2. Bridging fibrosis — the precursor to cirrhosis.

The grade = severity of necroinflammation; the stage = extent of fibrosis. Scoring systems: METAVIR (F0–F4), Ishak, Knodell HAI, Scheuer.

Progression flow: Hepatocyte injury → chronic inflammation + interface hepatitis → periportal fibrosis → bridging fibrosis → regenerative nodules + diffuse fibrosis = cirrhosis.

Alcoholic liver disease (ALD)

Three overlapping lesions, in classic sequence:

1. Hepatic steatosis (fatty liver) — earliest, fully reversible. Macrovesicular fat (large droplet displacing nucleus), starts centrilobular (zone 3). Large, soft, yellow, greasy liver.
2. Alcoholic (steato)hepatitis — the dangerous lesion:
   • Ballooning degeneration of hepatocytes
   • Mallory–Denk bodies (Mallory hyaline) — eosinophilic intracytoplasmic ropy inclusions of damaged intermediate filaments (cytokeratin 8 & 18 + ubiquitin + p62)
   • Neutrophilic infiltrate (surrounding ballooned cells, "satellitosis")
   • Pericellular/perisinusoidal "chicken-wire" fibrosis (zone 3)
   • Megamitochondria — round/needle-shaped eosinophilic cytoplasmic bodies
3. Cirrhosis — final, irreversible; classically micronodular ("Laennec cirrhosis").

High-yield: Mallory–Denk bodies are damaged cytokeratin (intermediate filament) aggregates. Seen in alcoholic hepatitis, but also Wilson disease, NASH, primary biliary cholangitis, Indian childhood cirrhosis, and HCC — so they are characteristic, NOT pathognomonic, of alcohol.

High-yield: In ALD the AST:ALT ratio is >2:1 ("AST = a Scotch and Tonic"). Pyridoxine (B6) deficiency in alcoholics limits ALT synthesis. GGT is also raised.

Mnemonic — Mallory body associations: "WHAT"

Wilson disease, Hepatocellular carcinoma / NASH, Alcoholic hepatitis, T = primary biliary cholangitis / Indian childhood cirrhosis.

Non-alcoholic fatty liver disease (NAFLD/NASH)

The hepatic manifestation of metabolic syndrome (obesity, T2DM, dyslipidaemia, insulin resistance). Histology is indistinguishable from alcoholic hepatitis (steatosis, ballooning, Mallory bodies, fibrosis) — the distinction is clinical (alcohol intake < 20 g/day). Now renamed MASLD/MASH (metabolic dysfunction-associated steatotic liver disease). NASH is now a leading cause of cryptogenic cirrhosis and a rising cause of HCC.

High-yield: NAFLD is the commonest cause of chronic liver disease in developed populations and the leading driver of "cryptogenic cirrhosis." In children NASH fibrosis is portal/zone 1, in adults it is centrilobular/zone 3.

Cirrhosis — definition & classification

Cirrhosis is the diffuse, irreversible end-stage of chronic injury, defined by three features:

1. Bridging fibrous septa (collagen types I & III deposited in space of Disse → loss of fenestrae, capillarisation of sinusoids).
2. Parenchymal (regenerative) nodules of hepatocytes.
3. Disruption of the entire architecture.

The principal collagen-producing cell is the hepatic stellate (Ito) cell, which on activation transforms into a myofibroblast. Normally it stores vitamin A (fat).

Morphological classification

Type	Nodule size	Causes
Micronodular	<3 mm, uniform	Alcohol (Laennec), haemochromatosis, biliary obstruction, Wilson disease
Macronodular	>3 mm, variable	Viral hepatitis (B, C), α1-antitrypsin deficiency
Mixed	Both	Many end-stage causes converge

High-yield: Alcohol → micronodular; viral hepatitis → macronodular. With time micronodular cirrhosis can convert to mixed/macronodular as larger regenerative nodules form.

Major aetiologies of cirrhosis (Indian context)

Alcohol, chronic HBV & HCV, NASH, autoimmune hepatitis, primary biliary cholangitis (anti-mitochondrial antibody, middle-aged women), primary sclerosing cholangitis (ulcerative colitis, p-ANCA, "beaded" ducts on MRCP, onion-skin fibrosis), haemochromatosis (HFE gene, bronze diabetes), Wilson disease (low ceruloplasmin, Kayser–Fleischer rings), α1-antitrypsin deficiency (PAS-positive diastase-resistant globules), and Indian childhood cirrhosis (copper-laden, Mallory bodies, micronodular).

Portal hypertension — pathophysiology

Portal pressure rises when portal venous resistance increases. Normal portal pressure 5–10 mmHg; HVPG (hepatic venous pressure gradient) > 5 mmHg is portal hypertension; varices form > 10 mmHg; bleeding risk > 12 mmHg.

Mechanisms: (1) increased intrahepatic resistance (sinusoidal capillarisation, stellate-cell contraction, fibrous distortion) plus (2) increased portal inflow (splanchnic vasodilatation driven by nitric oxide).

Classification by site of block

Site	Examples	Wedged hepatic venous pressure
Pre-hepatic	Portal/splenic vein thrombosis	Normal
Intrahepatic – presinusoidal	Schistosomiasis, congenital hepatic fibrosis, early PBC	Normal
Intrahepatic – sinusoidal	Cirrhosis (commonest)	Raised
Intrahepatic – postsinusoidal	Veno-occlusive (sinusoidal obstruction) syndrome	Raised
Post-hepatic	Budd–Chiari, constrictive pericarditis, RHF	Raised

High-yield: Schistosomiasis is the classic presinusoidal (pipestem fibrosis) portal hypertension — globally the commonest non-cirrhotic cause. Budd–Chiari = hepatic vein outflow obstruction → centrilobular congestion, "nutmeg liver" and caudate-lobe hypertrophy.

Four cardinal consequences of portal hypertension

1. Ascites (also driven by hypoalbuminaemia, secondary hyperaldosteronism, lymph leak).
2. Portosystemic shunts → oesophageal & gastric varices (haematemesis), caput medusae, haemorrhoids.
3. Congestive splenomegaly → hypersplenism (thrombocytopenia).
4. Hepatic encephalopathy (ammonia bypassing the liver) and hepatorenal/hepatopulmonary syndromes.

Bleed cascade: Cirrhosis → ↑intrahepatic resistance + splanchnic NO vasodilatation → portal HTN → oesophageal varices → rupture → upper GI bleed (a leading cause of death in cirrhosis).

Clinical features & decompensation

Compensated cirrhosis may be silent. Decompensation is heralded by jaundice, ascites, variceal bleed, or encephalopathy. Signs reflect hepatocellular failure + portal HTN + hyperoestrogenaemia: spider naevi, palmar erythema, gynaecomastia, testicular atrophy, Dupuytren contracture, leuconychia, clubbing, fetor hepaticus, asterixis (flapping tremor), and caput medusae.

Investigations & scoring

• LFTs: transaminases (AST/ALT pattern), ALP & GGT (cholestasis), bilirubin, albumin & PT/INR (synthetic function — the true severity markers).
• Non-invasive fibrosis: FibroScan (transient elastography), FIB-4, APRI, NAFLD fibrosis score.
• Imaging: USG (nodular shrunken liver, splenomegaly, ascites, recanalised umbilical vein), Doppler for portal flow.
• Liver biopsy — gold standard for grading/staging when needed; bridging fibrosis/nodularity confirms cirrhosis.
• Ascitic fluid: SAAG (serum-ascites albumin gradient) ≥ 1.1 g/dL = portal hypertension (transudate); < 1.1 = exudate (TB, malignancy, pancreatitis).
• Severity scores: Child–Pugh (A/B/C) uses bilirubin, albumin, INR, ascites, encephalopathy. MELD (bilirubin, INR, creatinine, sodium) guides transplant priority.

High-yield: SAAG ≥ 1.1 g/dL → portal hypertensive ascites (cirrhosis, CHF, Budd–Chiari). The classic Child–Pugh mnemonic is "A BEAN" — Albumin, Bilirubin, Encephalopathy, Ascites, INR.

Management essentials (drug of choice)

• Variceal bleed: resuscitation + terlipressin/octreotide (splanchnic vasoconstrictor) + endoscopic band ligation + prophylactic antibiotics (ceftriaxone/norfloxacin). TIPS for refractory bleeds.
• Primary variceal prophylaxis: non-selective beta-blockers (propranolol, carvedilol) or band ligation.
• Ascites: salt restriction + spironolactone ± furosemide; large-volume paracentesis with albumin; refractory → TIPS.
• Spontaneous bacterial peritonitis (SBP): ascitic PMN ≥ 250/mm³ → IV cefotaxime; norfloxacin prophylaxis.
• Hepatic encephalopathy: lactulose (first line) + rifaximin; treat precipitants (infection, GI bleed, constipation, electrolytes).
• Definitive: liver transplantation for decompensated cirrhosis/HCC within Milan criteria.
• Disease-specific: antivirals (entecavir/tenofovir for HBV; DAAs for HCV), abstinence in ALD, weight loss in NASH, penicillamine/zinc in Wilson, phlebotomy in haemochromatosis.

Complications

• Hepatocellular carcinoma (HCC) — cirrhosis is the dominant risk; surveillance with USG + AFP every 6 months. HBV can cause HCC without cirrhosis.
• Hepatorenal syndrome (functional renal failure, splanchnic vasodilatation).
• Hepatopulmonary syndrome (hypoxaemia, platypnoea, orthodeoxia) vs portopulmonary hypertension.
• Coagulopathy (↓clotting factors, ↓platelets), hyperdynamic circulation, dilutional hyponatraemia.

Key differentials (image-based)

Inclusion / cell	Composition	Disease
Councilman body	Apoptotic hepatocyte	Acute viral/yellow fever
Ground-glass hepatocyte	HBsAg in SER	Chronic HBV
Mallory–Denk body	Cytokeratin 8/18 + ubiquitin	Alcoholic hepatitis, NASH, Wilson, PBC, ICC
Megamitochondria	Swollen mitochondria	Alcoholic liver disease
PAS+ diastase-resistant globule	α1-antitrypsin polymer	α1-AT deficiency
Lipofuscin (wear-and-tear)	Oxidised lipid	Ageing, brown atrophy
Mallory body + copper	Copper	Wilson disease, ICC

Recently asked / exam angle

• Single-image stems are favourites: an eosinophilic ropy cytoplasmic inclusion with neutrophils → Mallory–Denk body / alcoholic hepatitis; a pale glassy cytoplasm → ground-glass hepatocyte / chronic HBV; a shrunken pink anucleate cell → Councilman body / apoptosis.
• Zone of injury matching: paracetamol/ischaemia → zone 3; phosphorus/viral → zone 1; yellow fever → zone 2.
• AST:ALT >2 → alcoholic liver disease; SAAG ≥1.1 → portal HTN ascites; ascitic PMN ≥250 → SBP.
• Micronodular vs macronodular classification with causes is repeatedly tested.
• Stains: orcein/Victoria blue for HBsAg (ground-glass); PAS-D for α1-AT; Perls' Prussian blue for iron (haemochromatosis); rhodanine/orcein for copper.
• Hepatic stellate (Ito) cell as the key fibrogenic cell and vitamin A store — a recurring one-liner.
• HEV mortality in pregnancy; HBV → HCC without cirrhosis.

Rapid revision

1. Councilman body = apoptotic hepatocyte, classic of yellow fever / acute viral hepatitis.
2. Ground-glass hepatocyte = chronic HBV (HBsAg in smooth ER), stains with orcein/Victoria blue.
3. Mallory–Denk body = damaged cytokeratin (IF); alcohol, NASH, Wilson, PBC, Indian childhood cirrhosis.
4. Alcohol → micronodular (Laennec) cirrhosis; viral hepatitis → macronodular.
5. AST:ALT >2:1 points to alcoholic liver disease ("a Scotch and Tonic").
6. Hepatic stellate (Ito) cell → activated myofibroblast = key fibrogenesis cell; stores vitamin A.
7. Zone 3 (centrilobular) = ischaemia/paracetamol/CCl₄; Zone 1 = viral/phosphorus.
8. SAAG ≥ 1.1 g/dL = portal hypertensive (transudative) ascites.
9. HVPG >12 mmHg → variceal bleeding risk; >5 mmHg = portal hypertension.
10. Schistosomiasis = presinusoidal (pipestem) portal HTN; Budd–Chiari = postsinusoidal/post-hepatic, nutmeg liver, caudate hypertrophy.
11. HBV is the only DNA hepatotropic virus and can cause HCC without cirrhosis; HEV is deadly in pregnancy.
12. SBP = ascitic neutrophils ≥ 250/mm³; treat with cefotaxime, prophylax with norfloxacin.