title: The vanishing subaortic membrane.
abstract: A fixed subaortic membrane is a rare cause for left ventricular outflow tract obstruction. This case report describes an unusual echocardiographic presentation of a subaortic membrane in which the membrane, initially not seen, was identified only after a linear shadow posterior to the membrane was seen on a transesophageal echocardiogram. This represents an unusual demonstration of an ultrasound beam 'dropout' of a subaortic membrane.
authors.affiliation: NYU Medical Center, Non-Invasive Cardiology Laboratory, 560 First Avenue, New York, NY 10016-6502, USA.
authors.forename: Rachel Levine
authors.initials: RL
authors.lastname: Berger
authors.forename: Itzhak
authors.initials: I
authors.lastname: Kronzon
mesh_terms: D000368:Aged; D001020:Aortic Stenosis, Subvalvular / Q000000981:diagnostic imaging / Q000601:surgery; D001021:Aortic Valve / Q000000981:diagnostic imaging*; D001024:Aortic Valve Stenosis / Q000000981:diagnostic imaging* / Q000601:surgery; D004452:Echocardiography; D005260:Female; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D014694:Ventricular Outflow Obstruction / Q000000981:diagnostic imaging* / Q000601:surgery