Method and result:
This is a case report of myopericarditis diagnosed with fever and chest
pain 3 days after the 2nd dose of Pfizer-BioNTech COVID-19 mRNA Vaccine
in an 18-year-old man. The diagnosis was confirmed by cardiac MRI(CMR),
but we presented that this diagnosis and follow-up could be made
accurately with strain echocardiography(SE).