Role of neuroradiology on evaluating cerebral aneurysms.

Intracranial aneurysms are common lesions with an adult prevalence rate between one and five percent in autopsy studies. Fortunately, most aneurysms are small and an estimated 50 to 80 percent of all aneurysms do not rupture during the course of a person’s lifetime . Intracranial aneurysms are considered to be sporadically acquired lesions, although a rare familiar form has been described 3. Clinically, cerebral aneurysms can be silent or give rise to focal neurological symptoms or rupture leading to the dramatic event of subarachnoid haemorrhage.