Cerebral arteriovenous malformation

Symptom of cerebral arteriovenous malformation

Symptoms due to hemorrhage

Unlike normal cerebral blood vessels, the high arterial blood pressure is transmitted directly to a vein or to an abnormal weak vessel, meaning that the weak portion of the vessel may break and bleed, causing a subarachnoid or intracerebral hemorrhage. Depending on the location of the hemorrhage, this may cause the symptoms of subarachnoid hemorrhage (headache and nausea, impaired consciousness, etc.) or intracerebral hemorrhage (motor disturbance of the arms and legs, etc.). Even for cerebral arteriovenous malformations that are not yet bleeding, hemorrhage occurs in around 2–4% of cases (one in every 25–50 people) each year. Even in the absence of hemorrhage, these abnormal vessels may also affect the activity of the surrounding brain, causing convulsions (seizures).

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