FDG PET/MRI of Acute Myocarditis After mRNA COVID-19 Vaccination

A 22-year-old man visited the emergency department with chest pain. He had received a second dose of the coronavirus disease 2019 (COVID-19) mRNA (Moderna) vaccine 5 days prior. F-18-FDG PET/MR revealed a focal FDG uptake and late gadolinium enhancement on the basal posterolateral wall of the left ventricle. Myocarditis after a COVID-19 vaccination has been reported predominantly after the second dose of mRNA vaccines in young men. This was a case of acute focal myocarditis after a COVID-19 mRNA vaccination, which was well-visualized by FDG PET/MRI.

Automated summary

This is a case of acute focal myocarditis after a COVID-19 mRNA vaccination in a 22-year-old male, which has been reported to occur more often after the second dose of the vaccine in young men. The inflammation site was well-visualized using FDG PET/MRI.