Last reviewed dd mmm yyyy. Last edited dd mmm yyyy
These are developmental anomalies of the intracranial vasculature. They may be any size and in any location. The middle cerebral artery is most often affected. Overall, men are affected more than women. Symptoms usually appear in the second or third decades.
They are implicated in 5% of subarachnoid haemorrhages.
Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page