Histiocytoid cardiomyopathy is an arrhythmogenic disorder characterized by cardiomegaly, severe cardiac arrhythmias or sudden death, and the presence of histiocyte-like cells within the myocardium. The disease is histiocytoid cardiomyopathy (Monarch Disease Ontology id MONDO_0010771). Also known as: Arachnocytosis of the myocardium, Purkinje cell hamartoma, congenital cardiomyopathy, foamy myocardial transformation of infancy, infantile cardiomyopathy with histiocytoid change, infantile xanthomatous cardiomyopathy, isolated Cardiac lipidosis, myocardial hamartoma.