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Table 4: 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.