Echocardiographic diagnosis of idiopathic hypertrophic subaortic stenosis (IHSS).
D000293:Adolescent; D001020:Aortic Stenosis, Subvalvular / Q000175:diagnosis*; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis*; D004452:Echocardiography; D006801:Humans; D008297:Male