Fig 4.

Pre (A) and post (B) contrast fat-suppressed 3D T1 and 3D T2-weighted (C) MR imaging in an axial plane shows T1 hypointense and T2 hyperintense perivascular infiltration (arrowhead) at the level of the carotid artery bifurcation, enhanced after gadolinium injection. A distinct soft intimal plaque (arrow) is visible at the posterior part of the carotid artery. A sagittal curvilinear reconstruction of the right internal carotid artery on the postcontrast T1-weighted imaging (D) shows the PVI (arrowhead) centered at the level of the right carotid artery bifurcation and extended to both the distal common carotid artery and proximal internal carotid artery. Note that there is no vascular or perivascular abnormality involving other parts of the common or the internal carotid arteries.