Ruptured intracranial aneurysms often have poor clinical outcome. International Study on Unruptured Intracranial Aneurysms has demonstrated the value of treatment for unruptured intracranial aneurysms and that aneurysms larger than 7mm may benefit from treatment. Although aneurysm size appears to be the major indication for rupture, other risk factors, including anatomical location and patient history, are also important in clinical evaluation and cannot be overlooked. Aneurysms at the anterior communicating artery (ACoA) especially have higher rupture risk and rupture at smaller sizes than other aneurysms.

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