Figure 1.

Findings rated positive for large-vessel vasculitis in the descending thoracic aorta according to MRI and FDG-PET/CT: MRI results show oedema on both T2w fat-suppressed (A) and low b-value diffusion-weighted sequences (B) accompanied by wall thickening and gadolinium enhancement according to post-contrast T1w GRASP (C). PET results show increased FDG uptake in the identical position (D). Figure (E) is a PET/MRI image fusion of the corresponding images (B,D) (Image fusion with Siemens SyngoVia version VB40). Red arrows highlight vessel wall oedema, contrast enhancement, and increased FDG uptake, respectively. Abbreviations: FDG = [¹⁸F]fluorodeoxyglucose; MRI = magnetic resonance imaging; PET/CT = FDG positron emission tomography/computed tomography; GRASP = Golden-angle radial sparse parallel (MRI).