Table 4.
Comparison of radiological features and performance of vertebral artery dissection between high-resolution vessel wall imaging with MR angiography and digital subtraction angiography.
| HR-VWI | DSA | |
|---|---|---|
| Angiographic finding | ||
| Fusiform dilatation | 12 (44.4%) | 11 (40.7%) |
| Interobserver agreement | 0.78 (95% CI = 0.55–1.00) | 0.77 (95% CI = 0.49–1.00) |
| Pearl–string sign | 16 (59.2%) | 16 (59.2%) |
| Interobserver agreement | 0.76 (95% CI = 0.49–1.00) | 0.69 (95% CI = 0.37–0.93) |
| Dissection sign | ||
| Double-lumen sign or intimal flap | 21 (77.7%) | 6 (22.2%) |
| Interobserver agreement | 0.88 (95% CI = 0.58–1.00) | 0.75 (0.36–1.00) |
| Intramural hematoma | 20 (74.0%) | Not evaluated |
| Interobserver agreement | 0.72 (95% CI = 0.36–1.00) | |
| Diagnosis | ||
| Definite VAD | 19 (70.3%) | 7 (25.9%) |
| Interobserver agreement | 0.91 (95% CI = 0.67–100) | 0.58 (95% CI = 0.13–0.89) |
Abbreviations: DSA, digital subtraction angiography; HR-VWI, high-resolution vessel wall imaging; VAD, vertebral artery dissection, CI; confidence interval.