Lower esophageal ring. 2.
D000328:Adult; D002648:Child; D004106:Dilatation; D004940:Esophageal Stenosis / Q000150:complications / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000209:etiology / Q000473:pathology / Q000601:surgery; D004941:Esophagitis / Q000150:complications; D006548:Hernia, Diaphragmatic / Q000150:complications; D006801:Humans; D009135:Muscular Diseases / Q000473:pathology; D011859:Radiography