Prehepatic obstructions are the most common form of presinusoidal portal hypertension, usually resulting from portal vein or splenic vein thrombosis. Unlike postsinusoidal obstructions, a normally low pressure portal venous bed is preserved beyond the obstacle, which is responsible for some specific hemodynamic changes.
KeywordsPortal Vein Portal Vein Thrombosis Superior Mesenteric Vein Splenic Vein Gastric Varix
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