<prompt> The common cause of subarachnoid hemorrhage IsAerio-venous malformationCavernous angiomaAneurysmHypeension  <response>: Subarachnoid hemorrhage commonly,but exclusively results from rupture of congenital berry aneurysms in the interpeduncular cistern . Subarachnoid haemorrhage, a medical emergency, is usually from a bulging blood vessel that bursts in the brain aneurysm. It may lead to permanent brain damage or death if not treated promptly Ref Harrison20th edition pg 2567 