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From there, blood makes its way to the Vena cava, the largest vein in the body to return to the heart. Portal hypertension describes elevated pressure within the portal system, including the portal vein and the tributary veins that drain into it.
High Blood Pressure. Malignant hypertension is a rare but very serious form of high blood pressure. Officially, malignant hypertension is defined as severe hypertension that occurs along with internal bleeding of the retinas in both eyes and swelling of optic nerves behind the retinas.