Supravalvular mitral stenosis associated with tetralogy of Fallot

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The association of tetralogy of Fallot with supravalvular mitral stenosis is a rare anomaly that has been reported only once previously. The difficulty of preoperative diagnosis is emphasized. Although left-sided obstructive lesions in association with tetralogy of Fallot are rare, their recognition is imperative since these are surgically correctable anomalies and potentially lethal, as proved in this case and the one previously reported.