Portal Hypertension Classification by site of vascular obstruction
1) Post-hepatic Post-sinusoidal: Budd-Chiari syndrome
2) Intrahepatic Post-sinusoidal: Veno-occlusive disease
3) Sinusoidal: Cirrhosis, Polycystic liver disease, Nodular regenerative hyperplasia, Metastatic malignant disease
4) Intrahepatic Pre-sinusoidal: Schistosomiasis, Congenital hepatic fibrosis, Drugs, Vinyl chloride, Sarcoidosis
5) Prehepatic Pre-sinusoidal: Portal vein thrombosis due to sepsis (umbilical, portal pyaemia) or procoagulopathy or secondary to cirrhosis, Abdominal trauma including surgery

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