The floppy valve syndrome (mucoid degeneration of the heart valves).
D001022:Aortic Valve Insufficiency / Q000209:etiology / Q000473:pathology; D002648:Child; D006349:Heart Valve Diseases / Q000209:etiology; D006801:Humans; D008944:Mitral Valve Insufficiency / Q000209:etiology / Q000473:pathology