Relapsing TIPIC Syndrome after Administration of an mRNA-Based COVID-19 Vaccine

Figure 1

Imaging results. (a) The initial CT showing a perivascular soft tissue alteration due to inflammation and/or edema with slight luminal compression on axial slices. (b) MRI demonstrated a membranous structure within the CCA and a distinct ventrally accentuated circumjacent contrast enhancement on axial T1w fs images. (c) Initial ultrasound imaging with 18 MHz probe (Philips Epiq 5©). Axial imaging of the left common carotid artery in its middle segment, note the multilayered structure (arrows; maximum thickness 3.8 mm in axial plan, longitudinal extension 30 mm). (d) Follow-up imaging after 3 months showing regression of the eccentric vessel wall swelling (arrows; thickness in axial plan 1.1 mm). (e) Follow-up imaging after 6 months showing mildly relapsing wall swelling without a clear multilayered structure (arrows; thickness 2.5 mm). (f) Follow-up imaging after 9 months showing regression of the vessel wall thickening (thickness 1.4 mm).