Arjen Lindenholz

69 The Use and Pitfalls of Intracranial Vessel Wall Imaging 3 Figure 11. (A-C) 7T transverse vessel wall MRI of a 44-year-old female with a spontaneous dissection of the left ICA, scanned 4 days after symptom onset. (A and B) 7T transverse precontrast (A) and postcontrast (B) T 1 -weighted MPIR-TSE images show a tapering of the lumen and vessel wall enhancement (white arrow) of the left distal ICA. (C) Diffuse concentric vessel wall enhancement and a dissection flap are seen on the postcontrast images more proximally in the left distal ICA at the skull base (white arrow). (D) Tapering of the distal ICA can also be appreciated on CTA (Computed Tomography Angiography), reformatted in the same orientation as (A) and (B) . Figure 12. 7T precontrast sagittal (A) and coronal (B) T 1 -weighted MPIR-TSE images of an anterior communicating artery (ACOM) aneurysm. The aneurysm wall shows a variation in wall thickness: the left lateral side and top of the aneurysm can be seen to have a thicker wall (white and black arrowhead), while the right lateral and anterior part of the aneurysm show a thinner wall (white and black open arrowhead). (C) 7T maximum intensity projection of the 3D TOF-MRA shows the corresponding anatomical geometry of the aneurysm (arrowheads).