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. 2002 Jan;23(1):93–101.

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American Society of Neuroradiology

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Fig 4. — Images obtained in a 76-year-old man with severe stenosis of the left vertebral artery.

A, Anteroposterior angiogram of left vertebral artery shows severe stenoses in the intracranial segment of the left vertebral artery (arrows).

B, MR angiogram (35/9.6; flip angle, 25°) also depicts severe stenoses in the left vertebral artery (arrows).

C, 3D CT angiogram shows aneurysm-like dilatation of both vertebral arteries (arrows), which correspond to the calcification of the vessel wall.

D, Axial source image shows no apparent lumen in the stenotic artery because of circumferential calcification. The segment was interpreted as being occluded (arrow). Finally, this segment was interpreted as being severe stenotic on the basis of MR angiographic findings.