title: Strictures, rings, webs and spasm.
mesh_terms: D003937:Diagnosis, Differential; D004940:Esophageal Stenosis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D004945:Esophagoscopy; D006801:Humans; D011859:Radiography; D013035:Spasm / Q000175:diagnosis*