Inflammation of the myocardium in acute rheumatic heart disease. The disease is Monarch Disease Ontology entry MONDO_0004582 (rheumatic myocarditis). Also known as: active rheumatic fever with myocarditis, acute rheumatic carditis, acute rheumatic myocarditis, acute rheumatic myocarditis (disorder) [ambiguous], rheumatic degeneration of myocardium, rheumatic fever with myocarditis, rheumatoid myocarditis.