Fig. 1

Imaging data of the case. A SAH surrounding potine was confirmed by head CT after onset. B Emergency CTA did not demonstrate definite source of hemorrhage. C, D Three-dimensional rotation angiography (3DRA) revealed a small aneurysm localized at posterior perforator of rostral basilar trunk. E, F The lesion disappeared from DSA during 2 months of follow-up with preservation of parent perforator