Arteriovenous malformations are abnormal clusters of blood vessels which can be seen in any part of the human body. They are congenital in nature. In he brain ,AVM's may have no symptoms at all and the abnormality may be picked during a brain scan for another reason. However, one the commonest presentations is with a bleed in the brain resulting in paralysis or unconsciousness . Another form of presentation can be seizures . Its also known that AVM,s can at time's result in frequent head aches termed "vascular headaches". When detected, AVMs are ideally treated to prevent bleeding in future.
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