Introduction: Reported cases after the post-commercialization phase of mRNA vaccines against COVID-19 have revealed that myocarditis and pericarditis may occur predominantly in male adolescents after the second dose of the vaccine.
Case Presentation: We report two cases of cardiac disorders associated with mRNA COVID-19 vaccination, both of them in 15 year-old males. One of the patients presented acute pericarditis and the second one presented acute myocarditis with left ventricular dysfunction at hospital discharge.