<prompt> The common cause of subarachnoid hemorrhage is:Aerio-venous malformationCavernous angiomaAneurysmHypeension  <response>: Answer is C Aneurysm: The most common cause of subarachnoid haemorrhage is rupture of a saccular aneurysm excluding head trauma - Harrison. Previously asked frequently as follows: Excluding hand trauma Most common cause of subarachnoid haemorrhage is rupture of a saccular aneurysmQ Most common cause of subarachnoid haemorrhage is rupture of a Berry aneurysmQ Most common cause of subarachnoid haemorrhage is rupture of Circle of Willis aneurysmQ. Saccular aneurysms are synonymous with Berry Aneurysms and most commonly occur in the anterior circulation on the Circle of Willis. 