Imaging of patient 4. (A) Maximum-intensity projection of a 3D time-of-flight MRA of the neck vessels in an oblique projection. Flow is just visible at the origin of the left ICA (arrow), but distal flow is attenuated and discontinuous. (B) Maximum-intensity projection of the repeat 3D time-of-flight MRA of the neck vessels at 3 months. The left ICA now shows continuous flow, but remains of diffusely reduced caliber (arrows). The linear artifact across all the vessels is due to the multi-slab MR technique. (C) Axial T1-weighted image with fat saturation showing high signal thrombus in the lumen of the left ICA (arrow), whereas no hematoma is seen in the wall of the vessel. (D) Line drawing illustrating anatomical features of panel C. ijv indicates internal jugular vein; and vert, vertebral artery.