Abstract
Intracranial aneurysms are focal pathological dilatation of the arteries with a prevalence of 3.2%. Mainly genetic disorders, family history, hypertension and smoking put patients at high risk of intracranial aneurysms formation. MR angiogram, CT angiogram or conventional angiography can detect aneurysms 5 mm or larger in size. Fusiform aneurysms are rare and mainly due to dissection or atherosclerosis. Majority of these are in the posterior circulation and represent 3-13% of all intracranial aneurysms. These may be presented as stroke, cranial nerve palsies, brainstem compression and SAH. A diameter greater than 10 mm is a risk factor for rupture and warrants early intervention.
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