title: Achalasia of the esophagus. Diagnosis and treatment.
mesh_terms: D004342:Drug Hypersensitivity / Q000150:complications; D004931:Esophageal Achalasia / Q000000981:diagnostic imaging / Q000628:therapy; D004935:Esophageal Diseases / Q000628:therapy; D004945:Esophagoscopy; D004947:Esophagus / Q000000981:diagnostic imaging; D006801:Humans; D008688:Methacholine Compounds / Q000494:pharmacology; D011859:Radiography
chemical_list: D008688:Methacholine Compounds