<prompt> Bird beak appearance of esophagus:Achalasia cardiaCancer esophagusSchatzki ringDES  <response>: Ans. a Achalasia cardiaRef: Bailey and Love 26th edition, Page 1014Interesting Barium swallow findings in esophagus: Bird beak appearance: Achalasia Rat tail appearance: Cancer esophagus more commonly Hurst phenomenon: Achalasia Cork screw appearance: DES Postcricoid web: Plummer Winson syndrome Naclerio V sign Pneumo mediastinum in Xray - Esophageal Perforation 