A condition in which the myocardium is hypertrophied without an obvious cause. The hypertrophy is generally asymmetric and may be associated with obstruction of the ventricular outflow tract. The disease is MONDO_0005045 (hypertrophic cardiomyopathy). Also known as: hypertrophic obstructive cardiomyopathy, hypertrophic subaortic stenosis, obstructive hypertrophic cardiomyopathy.