Long-segment (tunnel) subaortic stenosis.
D000293:Adolescent; D000790:Angiocardiography; D001020:Aortic Stenosis, Subvalvular / Q000150:complications / Q000175:diagnosis*; D006332:Cardiomegaly / Q000150:complications; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis*; D002648:Child; D004452:Echocardiography; D006337:Heart Murmurs; D006801:Humans; D008297:Male