title: Achalasia of the oesophagus.
mesh_terms: D001466:Barium Sulfate; D003937:Diagnosis, Differential; D004931:Esophageal Achalasia / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011859:Radiography
chemical_list: D001466:Barium Sulfate