Commonest cause of subarachnoid haemorrhage is:: (A) Rupture of circle of Willis aneurysm, (B) Rupture or veebral aery aneurysm, (C) Rupture of venecomitants of corpus striatum, (D) Rupture of dural sinusis
Answer is A. Answer is A (Rupture of circle of Willis aneurysm): Most common cause of subarachnoid haemorrhage is ruptured saccular aneurysms. Most common site of saccular aneurysms is the anterior circulation on the circle of Willis