Circle of Willis score | No. of patients (%)* | ASITN/SIR grade5, 6 | No. of patients (%) |
---|---|---|---|
0 (poor) | 17 (20.2) | 0 (none) | 22 (28.6) |
1 (poor) | 12 (14.3) | 1 (poor) | 21 (26.2) |
2 (poor) | 20 (23.8) | 2 (poor) | 30 (35.7) |
3 (good) | 17 (20.2) | 3 (good) | 3 (3.6) |
4 (good) | 11 (13.1) | 4 (good) | 8 (9.5) |
5 (good) | 4 (4.8) | – | – |
6 (good) | 3 (3.6) | – | – |
*The circle of Willis score could not be obtained in one patient in the endovascular group due to the absence of complete four-vessel angiography.
ASITN/SIR, American Society of Interventional and Therapeutic Neuroradiology/Society of Interventional Radiology.