fig1

Figure 1. (a) The dissecting aneurysm on the C1 segment of right internal carotid artery; (b) "rat tail sign" of the left internal carotid artery before predilation; (c) the anterior communicating artery was open and the left middle cerebral artery territory got collateral blood flow from the right middle cerebral artery; (d‑f) severe bilateral stenosis on the V2 segment of both VAs; (g) left vertebral arteries after stenting; (h) left internal carotid artery after balloon predilation