Lower esophageal ring. 1.
D001344:Autopsy; D003680:Deglutition Disorders / Q000209:etiology; D004940:Esophageal Stenosis / Q000150:complications / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000196:embryology / Q000453:epidemiology / Q000473:pathology; D004941:Esophagitis / Q000150:complications; D006548:Hernia, Diaphragmatic / Q000175:diagnosis; D006801:Humans; D008875:Middle Aged; D009092:Mucous Membrane; D011859:Radiography