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: (A) Posterior Inferior Cerebellar Aery Aneurysm, (B) Anterior Communicating Aery Aneurysm, (C) Posterior Communicating Aery Aneurysm, (D) Basilar Aery Tip Aneurysm
Answer is C. *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