title: Idiopathic achalasia and Chagasic megaesophagus.
mesh_terms: D014355:Chagas Disease / Q000503:physiopathology*; D004931:Esophageal Achalasia / Q000503:physiopathology*; D004943:Esophagogastric Junction / Q000503:physiopathology; D006801:Humans