MedlinePlus- Myocarditis Myocarditis. Myocarditis myocarditis Myocarditis MyocarditisExternal Myocarditis MDP https://medlineplus.gov/ency/article/000149.htm medlineplus.gov/ency/article/000149.htm Myocarditis Myocarditis MedlinePlus- Myocarditis Myocarditis