Table 1. The MRI-DRAGON Score (0–10 points).

Parameters (before IV-tPA)	Points
M1 occlusion	1
DWI-ASPECTS ≤5	1
Prestroke mRS >1	1
Age
65–79	1
≥80	2
Glucose level >8 mmol/L	1
Onset-to-treatment time >90 min	1
NIHSS score
5–9	1
10–15	2
>15	3

IV-tPA: intravenous thrombolysis; M1: M1 segment of the middle cerebral artery. Any proximal M1 occlusion on admission MR Angiography was considered, irrespective of the status of other arteries.

mRS: Modified Rankin scale. NIHSS: National Institute of Health Stroke Scale. DWI-ASPECTS: Diffusion-weighted imaging Alberta Stroke Programme Early CT score.