[Comment] Probing our understanding of intracranial aneurysms

Intracranial aneurysms are detected in about 3% of adults who undergo brain vascular imaging.1,2 About 7 million people in the US alone have an intracranial aneurysm, which are being detected more frequently due to the increasing use and sensitivity of brain vascular imaging. The most important manifestation of an intracranial aneurysm is subarachnoid haemorrhage, but its incidence is only 6 per 100 000 population per year.3 This discrepancy between the prevalence of intracranial aneurysms and the incidence of subarachnoid haemorrhage means that most intracranial aneurysms never rupture.