Table 1.

Angiogram-only strokes

Patient Numb er	Age/ Gend er	Qualifying Event	Baseline Imaging	Location of Stenotic Artery	Timing QE to Procedure (days)	Procedural and Stroke Details	Mechanism of Stroke Associated with Clinically Relevant Infarct	30-day Outco me
35	57/M	Stroke: Ataxia And weakness	MR (+ infarct)	Vertebrobasil ar junction	7	80% lesion at VBJ by diagnostic catheter angiogram Angiogram under anesthesia showed significant reduction in stenosis, now <60%. New PICA evident on angio (Figure 2) New vision loss post angio. New occipital and posterior inferior cerebellar artery territory strokes on repeat MR	Embolic Complication of angio	mRS 4
36	70/F	Stroke: dysarthria, arm and leg weakness	No baseline MR or CT submitte d	Basilar	5	Diagnostic angiogram (3 days after stroke) demonstrated 98% basilar stenosis Therapeutic (for planned angioplasty) angiogram showed interval occlusion at the site of tenosis Retrograde filling from PComA. atient awoke stable Acute stroke in territory 3 days later. New infarctions by MR in pons and midbrain	Delayed thrombo- embolic	Died 3 days after angio
37	74/F	Stroke: face, arm and leg weakness, aphasia	CT (+ infarct)	Internal carotid artery	4	Catheter angiogram (2 days after stroke) demonstrated 89% cavernous ICA stenosis Treatment angiogram showed complete occlusion Acute stroke in the territory 5 days later while in rehab. (Figure 2, MR ADC maps)	Delayed thrombo- embolic	mRS 4

Infarct size: 1.5 cm or less – small, 1.5 to 3.0 cm – medium. No petechial hemorrhage unless otherwise noted. Corresponding images described in the

“Procedural and Stroke Details” are shown in Figure 2 by patient number, unless indicated otherwise.

M = male; F = female; MR = magnetic resonance; CT = computed tomography; mRS = modified Rankin score; QE = Qualifying event; ADC = apparent diffusion coefficient)