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Table 4: Summary of periprocedural events
Age/Sex Presenting Symptom Initial NIHSS Type of Lesion Adverse Event Time Interval after Procedure Imaging Finding Possible Cause of Event F/U Period (months) Final Status (mRS)
60/M Progressively deteriorating 13 Ipsilateral remote tandems (BA + vertebral ostium) Death 4 hours ICH + SAH on CT Hyperperfusion, bleeding tendency or basilar arterial injury – 6
45/M TIA 0 Ipsilateral adjacent tandems (M1 segment) Minor stroke 1 day Ischemia of basal ganglia on MR Imaging Partial stent thrombosis 17 0
67/M TIA 1 Bilateral ICA bulb lesions Minor stroke 11 days Small ICH on CT Delayed hyperperfusion 15 0
69/M Fluctuating after repeated strokes 10 Ipsilateral adjacent tandems (Intradural VA + VBJ) Major stroke 1 day Pontine ischemic change Perforator ischemia 13 5
68/M TIA 2 Ipsilateral remote tandems (cavernous ICA + carotid bulb) Minor stroke 2 days Cortical HSI Thromboembolic events 6 0
Note:—ICA indicates internal carotid artery; SAH, subarachnoid hemorrhage; ICH, intracerebral hemorrhage; TIA, transient ischemic attack; HSI, high signal intensity; BP, blood pressure; mRS, modified Rankin Scale; VBJ, vertebrobasilar junction; VA, vertebral artery; BA, basilar artery.

Age/Sex	Presenting Symptom	Initial NIHSS	Type of Lesion	Adverse Event	Time Interval after Procedure	Imaging Finding	Possible Cause of Event	F/U Period (months)	Final Status (mRS)
60/M	Progressively deteriorating	13	Ipsilateral remote tandems (BA + vertebral ostium)	Death	4 hours	ICH + SAH on CT	Hyperperfusion, bleeding tendency or basilar arterial injury	–	6
45/M	TIA	0	Ipsilateral adjacent tandems (M1 segment)	Minor stroke	1 day	Ischemia of basal ganglia on MR Imaging	Partial stent thrombosis	17	0
67/M	TIA	1	Bilateral ICA bulb lesions	Minor stroke	11 days	Small ICH on CT	Delayed hyperperfusion	15	0
69/M	Fluctuating after repeated strokes	10	Ipsilateral adjacent tandems (Intradural VA + VBJ)	Major stroke	1 day	Pontine ischemic change	Perforator ischemia	13	5
68/M	TIA	2	Ipsilateral remote tandems (cavernous ICA + carotid bulb)	Minor stroke	2 days	Cortical HSI	Thromboembolic events	6	0