title: Preoperative echographic diagnosis of supravalvular stenosing ring of the left atrium.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004452:Echocardiography; D006325:Heart Atria / Q000002:abnormalities* / Q000601:surgery; D006801:Humans; D008297:Male; D008943:Mitral Valve / Q000002:abnormalities* / Q000601:surgery