<prompt> All are true about achalasia except:It predisposes to malignancyBody peristalsis is normalLES pressure is increasedDilatation of proximal segment  <response>: Ans. b Body peristalsis is normalRef: Sabiston 20th Edition, Pages 1015-1018Salient Points in Achalasia: Achalasia - Meaning failure to relax Men women affected equally Dysphagia, regurgitation and weight loss are the triad of symptomsPathogenesis: Progressive inflammation and selective loss of Inhibitory myenteric neurons in Auerbachs Plexus of the esophagus that normally secretes VIP and Nitric oxide and relaxes the LES. Because of this the excitatory neurons acts and contracts the LES by Ach. Aperistalsis in Esophagus, dilated esophagus and obstructed LES happens. 