A patient with suspected subarachnoid haemorrhage presents with blood isolated in the fouh ventricle on a CT scan. Aneurysmal rupture is likely to have resulted from
*Saccular aneurysm at size of >7mm and at top of basilar aery and at origin of posterior communicating aery are at greater risk of rupture . Ref Harrison20th edition pg 2445
Posterior Inferior Cerebellar Aery Aneurysm
Anterior Communicating Aery Aneurysm
Posterior Communicating Aery Aneurysm
Basilar Aery Tip Aneurysm
C.N.S