A dangerous type of hypertension marked by an unusually sudden rise in blood pressure to very high levels, often accompanied by headache, blurred vision, and seizures (see Hypertension).
Malignant hypertension is a complication of hypertension characterized by very elevated blood pressure, and organ damage in the eyes, brain, lung and/or kidneys. It differs from other complications of hypertension in that it is accompanied by papilledema. Systolic and diastolic blood pressures are usually greater than 240 and 120, respectively.