Summary of overgraded arteries (n = 13)
| Enrollment Number | Location | Stenosis on MRA Observers 1/2 (%) | Stenosis on DSA (%) | Estimated Causes |
|---|---|---|---|---|
| 3 | Right MCA, bifurcation | 45/55 | 0 | Venetian blind artifact |
| 3 | Left MCA, M1 portion | 85/0 | 0 | Venetian blind artifact |
| 41 | Right MCA, bifurcation | 50/63 | 34 | Intravoxel phase dispersion |
| 43 | Left MCA, proximal M1 | 90/80 | 40 | Intravoxel phase dispersion |
| 43 | Right MCA, M1 segment | 95/100 | 99 | Near occlusion of M1 |
| 5 | Right ICA, petrocavernous junction | 55/43 | 29 | Observer error |
| 10 | Right ICA, petrocavernous segment | 66/70 | 0 | Near occlusion of proximal ICA without distal stenosis |
| 13 | Right ICA, petrocavernous segment | 0/60 | 0 | Near occlusion of proximal ICA without distal stenosis |
| 17 | Right ICA, petrocavernous segment | 40/51 | 41 | Borderline stenosis |
| 31 | Right ICA, petrocavernous segment | 100/90 | 99 | Near occlusion of ICA due to multifocal stenosis |
| 36 | Right ICA, supraclinoidal segment | 100/100 | 99 | Near occlusion of ICA due to multifocal stenosis |
| 36 | Left ICA, petrocavernous segment | 40/80 | 38 | Intravoxel phase dispersion |
| 10 | Left distal VA segment | 80/0 | 0 | Left subclavian steal |
Note:—MCA indicates middle cerebral artery; M1, horizontal segment of MCA; ICA, internal carotid artery; VA, vertebral artery; MRA, 3-dimensional time-of-flight MR angiography; DSA, digital subtraction angiography.