Table 1. ASITN/SIR collateral grade by vessela.
| Vessel | No collaterals | Partial collaterals | Complete collaterals |
|---|---|---|---|
| ICA (n=39) | 29 (74%) | 5 (13%) | 5 (13%) |
| MCA (n=84) | 55 (65%) | 17 (20%) | 12 (14%) |
| VA (n=69) | 50 (72%) | 9 (13%) | 10 (14%) |
| BA (n=71) | 49 (69%) | 12 (17%) | 10 (14%) |
| Combined (n=24) | 14 (58%) | 5 (21%) | 5 (21%) |
| Overall (n=287) | 197 (68%) | 48 (17%) | 42 (21%) |
ASITN/SIR, American Society of Interventional and Therapeutic Neuroradiology/Society of Interventional Radiology; BA, basilar artery; ICA, internal carotid artery; MCA, middle cerebral artery; VA, vertebral artery.
a
Data presented are sample size (percent). χ2 P-value=0.9108.