# Portal Hypertension

> Portal hypertension for NEET-PG Pathology: prehepatic, presinusoidal including schistosomiasis, cirrhotic and posthepatic causes with varices and ascites.

- Canonical URL: https://prepelephant.com/topics/neet-pg/pathology/portal-hypertension-pathology
- Exam / course: NEET-PG · 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: "Portal Hypertension", PrepElephant, https://prepelephant.com/topics/neet-pg/pathology/portal-hypertension-pathology

## Direct answer

Portal hypertension is raised pressure in the portal venous system, classified by the site of obstruction: prehepatic (portal vein thrombosis), intrahepatic presinusoidal (schistosomiasis — the commonest cause worldwide — and non-cirrhotic portal fibrosis, an important Indian entity), sinusoidal (cirrhosis, the commonest cause overall), and posthepatic or postsinusoidal (hepatic vein thrombosis of Budd-Chiari syndrome and veno-occlusive disease). The consequences follow from decompression through portosystemic collaterals — bleeding oesophageal varices above all — plus congestive splenomegaly with hypersplenism, ascites and portosystemic encephalopathy.

## What you must remember

- **Classification by site:** prehepatic (portal vein thrombosis, often from neonatal sepsis or hypercoagulability), presinusoidal (schistosomiasis eggs, non-cirrhotic portal fibrosis, sarcoidosis, early primary biliary cholangitis), sinusoidal (cirrhosis of any cause), postsinusoidal (veno-occlusive disease/sinusoidal obstruction syndrome) and posthepatic (Budd-Chiari, right heart failure, constrictive pericarditis).
- **Cirrhosis as commonest overall:** architectural distortion and fibrosis raise intrahepatic resistance while splanchnic hyperaemia raises inflow; clinically significant when the hepatic venous pressure gradient exceeds about 10 mm Hg.
- **Non-cirrhotic portal fibrosis:** a presinusoidal cause common in India — young patients with well-preserved synthetic function presenting with variceal bleeding and hypersplenism, with portal vein cavernoma on imaging.
- **Collateral decompression:** gastro-oesophageal varices (the lethal route), anorectal varices, recanalised paraumbilical veins forming caput medusae and retroperitoneal collaterals.
- **Consequences:** variceal haemorrhage with massive haematemesis, congestive splenomegaly causing pancytopenia from hypersplenism, ascites from sinusoidal hypertension plus hypoalbuminaemia and hyperaldosteronism, and portosystemic encephalopathy from shunted ammonia.
- **Budd-Chiari syndrome:** hepatic vein thrombosis in hypercoagulable states, myeloproliferative neoplasms, pregnancy and membranous webs — painful hepatomegaly, ascites and a nutmeg-like congested liver that can infarct centrilobular zones.
- **Management directions:** beta blockade and endoscopic band ligation for variceal prophylaxis, transjugular intrahepatic portosystemic shunt for refractory bleeding or ascites, and treatment of the underlying cause per current guidance.

## Common confusion

The classification sites are repeatedly swapped: schistosomiasis is presinusoidal (egg granulomas in portal tracts) with preserved hepatocyte function until late, whereas cirrhosis is sinusoidal with poor function; this distinction drives prognosis and transplant decisions. Oesophageal varices versus Mallory-Weiss tears both bleed after vomiting-contexts, but varices give painless massive haematemesis. Ascites mechanisms blend portal pressure, hypoalbuminaemia and secondary hyperaldosteronism — do not attribute it to pressure alone.

## Exam-focused takeaway

Stems describe a young Indian man with variceal bleed, splenomegaly and normal liver tests (non-cirrhotic portal fibrosis), a farmer with hepatosplenomegaly from fresh-water exposure (schistosomiasis), or a woman with a thrombophilia and painful ascites (Budd-Chiari). Questions ask to classify the site of obstruction, name the collateral pathways, or match the consequence — varices, hypersplenism, ascites, encephalopathy — to its mechanism.

## Frequently asked questions

### What is the commonest cause of portal hypertension worldwide and locally?

Cirrhosis is the commonest overall, while schistosomiasis is the commonest presinusoidal cause globally and non-cirrhotic portal fibrosis is an important cause in India.

### How is portal hypertension classified anatomically?

Prehepatic, intrahepatic presinusoidal, sinusoidal, postsinusoidal and posthepatic, according to the site of resistance to portal flow.

### What is caput medusae?

Periumbilical collaterals from a recanalised paraumbilical vein fanning outward from the umbilicus in chronic portal hypertension.

### Why does hypersplenism develop?

Congestive splenomegaly sequesters and destroys blood cells, producing anaemia, leucopenia and thrombocytopenia in parallel with the splenomegaly.

### What is Budd-Chiari syndrome?

Thrombosis of hepatic veins causing painful hepatomegaly, ascites and centrilobular congestion, typically in hypercoagulable or myeloproliferative states.