Fig. (9).

In a patient with right sided Horner syndrome short white arrows show increase in external diameter of distal cervical ICA on axial T1 (A), hyperintensity in the wall of the vessel secondary to intramural thrombus on fat-sat axial T1A (B), eccentric luminal narrowing and mural thickening on source image of 3D- TOF MRA (C), diffusion changes related to blood product within the wall of the vessel on DWI (D) and corresponding ADC map (E), contrast extravasation from the narrowed lumen into thickened vessel wall on axial CTA (F), narrowed right ICA at the skull base on contrast enhanced MRA (G) and dissecting aneurysm on sagittal MIP of CTA (H).