Fig. 4.

Baseline and follow-up CMR in COVID-19 vaccine–associated myocarditis. Short-axis cardiac MRI images in a young adult man with myocarditis following the second dose of mRNA-1273. Baseline MRI at 1.5 T demonstrates subepicardial late gadolinium enhancement (LGE) at the basal inferior and inferolateral wall (red arrows) with corresponding high T2 signal in keeping with edema (yellow arrows), high regional native T1 (green arrows), and high regional T2 (blue arrows). Follow-up cardiac MRI performed 4 months later at 3 T demonstrates interval decrease in LGE extent (orange arrow) with resolution of edema and normalization of T1 and T2 values.