The vanishing subaortic membrane

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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.

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