A form of CARDIAC MUSCLE disease, characterized by left and/or right ventricular hypertrophy (hypertrophy, left ventricular; hypertrophy, right ventricular), frequent asymmetrical involvement of the heart septum, and normal or reduced left ventricular volume. risk factors include hypertension; AORTIC STENOSIS; and gene mutation; (FAMILIAL HYPERTROPHIC CARDIOMYOPATHY).