<prompt> All of the following are true about achalasia cardia except: March 2012Bird beaks appearanceAbsent air bubble in stomachDecreased lower oesophageal sphincter toneAbsent peristalsis in the body of oesophagus  <response>: Ans: C, Decreased lower oesophageal sphincter toneAchalasia cardiaBarium radiology may show a tapering stricture in the distal oesophagus, often described as a birds beak. The gastric bubble is usually absent.The physiological abnormalities in achalsia cardia are non-relaxing LOS lower oesophageal sphincter and absent peristalsis in the body of the oesophagus. 