Conclusions For the negative angiogram in SAH, we should consider the possibility of aneurysmal spontaneous occlusion.The intracranial aneurysm, giant or not, has inclination of self-healing.

• 结论在蛛网膜下腔出血全脑血管造影阴性时，要考虑到动脉瘤自闭的可能，不论是否巨大动脉瘤，均有发生自闭的可能。