Fig. 3

High-risk plaque of the right VA (arrow) featured as an iso-intense signal on pre-enhanced T1W image and obviously enhanced post-contrast, and that of the left VA (arrowhead) characterized as a hyperintense signal on pre-enhanced T1W image and insignificantly enhanced post-contrast (a,b). Clip angles between bi-VAs (VAJ), BA and right VA (VBJR), and BA and left VA (VBJL) were measured on the coronal images (c). BA basilar artery, VA vertebral artery, T1W T1-weighted.