FIG 6. AROP. 3D-TOF MR angiogram, anteroposterior projection, shows bilateral petrous ICA stenosis (arrows), with more diffuse stenosis also evident in the left ICA.

FIG 7. AROP. 2D-TOF MR angiogram, left lateral projection, shows segmental vertebral artery stenoses with collateral flow in the ascending cervical arteries, anastomosing with the vertebral arteries above the level of the most cranial transverse foramen.