Treatment of Unruptured Cerebral Aneurysm When Estimated 5-Year Rupture Risk Exceeds Treatment Risk
Not every unruptured cerebral aneurysm requires immediate intervention, but specific clinical triggers — centred on rupture risk, aneurysm growth, and symptomatic presentation — identify patients for whom preventive repair is appropriate. This protocol applies to aneurysms not located in the posterior circulation.
When This Protocol Applies
Preventive repair is considered in adults with an unruptured intracranial aneurysm (anterior circulation) when at least one of the following is present:
- The estimated 5-year risk of aneurysm rupture is higher than the risk of the preventive treatment modality itself
- Growth of the aneurysm (≥1 mm in any direction) has been detected on follow-up imaging
- Clinical symptoms are present — such as cranial nerve deficits, mass effect, or thromboembolic events
Approach
Management involves preventive aneurysm repair; the full protocol specifies how to select the most appropriate treatment modality for the individual aneurysm and the circumstances under which each option is favoured.
References
DOI: 10.1177/23969873221099736
- In adult patients in whom the estimated 5-year risk of aneurysm rupture is higher than the risk of the preventive treatment modality, we suggest preventive aneurysm repair with the treatment modality that is most effective and safe for that particular aneurysm.
- In adult patients with growth of a UIA detected at follow up imaging, we suggest preventive aneurysm repair.
- In adult patients with UIA who present with clinical symptoms, such as cranial nerve deficits, mass effect and thromboembolic events, we suggest preventive aneurysm repair, taking into account life expectancy and risk of treatment complications.
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