The most common cause of subarachnoid hemorrhage is:: (A) Aeriovenous malformation, (B) Cavernous angioma, (C) Aneurysm, (D) Aneurysm
Answer is C. Answer is C (Aneurysm): The most common cause of subarachnoid haemorrhage is rupture of a saccular aneurysm (Saccular aneurysms are synonymous with Berry Aneurysms or 'Circle of Willi's aneurysms' and most commonly occur in the anterior circulation on the Circle of Willis).