title: Acquired supravalvar membranous stenosis of the left atrioventricular valve.
abstract: Acquired supravalvar membranous stenosis of the left atrioventricular valve developed in a nine year old boy with atrioventricular discordance. The supravalvar membrane had not been present when a partial annuloplasty was performed on the left atrioventricular valve eight years before. The stenosis was relieved by operative excision of the membrane.
mesh_terms: D002648:Child; D006801:Humans; D008297:Male; D008943:Mitral Valve / Q000601:surgery; D008946:Mitral Valve Stenosis / Q000209:etiology*; D011183:Postoperative Complications / Q000209:etiology*; D013997:Time Factors