A disease of the heart muscle or myocardium proper. Cardiomyopathies may be classified as either primary or secondary, on the basis of etiology, or on the pathophysiology of the lesion: hypertrophic, dilated, or restrictive. The disease is cardiomyopathy (MONDO_0004994, a Monarch Disease Ontology id). Also known as: Cardiomyopathies.