Commonest cause of subarachnoid haemorrhage is:
Rupture of circle of Willis aneurysm
Rupture or veebral aery aneurysm
Rupture of venecomitants of corpus striatum
Rupture of dural sinusis
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