Arjen Lindenholz

170 CHAPTER 7 Figure 4 . A 67-year-old male with an occlusion of the left M1-M2 segment, successfully treated with intra- arterial thrombectomy (patient number 14 in Table 2 ). Patient was treated with both a stent-retriever device and a thrombosuction device. Axial pre- ( A ) and postcontrast ( B ) magnetization-prepared inversion recovery turbo spin-echo (MPIR-TSE) vessel wall images at 7T 87 days after the thrombectomy procedure. Clear contrast enhancement is present (white arrows), at the same location as the thrombectomy was performed. The carotid and basilar arteries appear normal (white arrowheads in A and B ). ( C ) Subtraction image of the pre- and postcontrast vessel wall images confirms the enhancement at the same location. ( D and E ) Coronal views of the postcontrast MPIR-TSE vessel wall images show enhancement over a long trajectory of the left M1 and M2 segments. ( F ) Sagittal view of the postcontrast MPIR-TSE vessel wall image shows that the enhancement has a concentric configuration.