Risk factors for cerebral aneurysm rupture

	Relative lower risk of rupture	Relative higher risk of rupture^*
Aneurysm size	Size <7 mm	Size >10 mm; large aneurysms (>20 mm) are at very high risk of rupture
Aneurysm location	Cavernous carotid, middle cerebral artery	Posterior circulation, posterior communicating and anterior communicating arteries
Aneurysm growth	Stable size over time	Size growth over time
Prior SAH	No history of SAH	History of aneurysmal SAH
Aneurysm morphology	–	Daughter sac or bleb
Hypertension	Absent history, well-controlled	Present history, poorly controlled
Smoking	Nonsmoker	Current smoker

These risk factors impact the risk of aneurysm rupture; consideration of these risks is used to guide management decisions for patients with unruptured, asymptomatic aneurysms.

SAH: subarachnoid hemorrhage.

* The magnitude of risk associated with individual risk factors varies; refer to the related UpToDate topic on unruptured intracranial aneurysms for further discussion.

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Risk factors for cerebral aneurysm rupture