[Case of subvalvular aortic stenosis due to accessory tissue on the mitral valve].
D000293:Adolescent; D001020:Aortic Stenosis, Subvalvular / Q000209:etiology* / Q000601:surgery; D002312:Cardiomyopathy, Hypertrophic / Q000209:etiology*; D006801:Humans; D008297:Male; D008943:Mitral Valve / Q000002:abnormalities*