<prompt> Bird beak appearance is seen in-Achlasia cardiaCarcinoma esophagusHiatus herniaDiffuse esophageal spasm  <response>: Ans. is a i.e., Achlasia cardia Important esophageal signs on radiographySignConditionRat tail appearance of esophagusEsophageal carcinomaMega-esophagus sigmoid esophagusBird beak appearanceHurst phenomenonAchlasia cardiaYo-Yo motion of bariumCorkscrew appearance esophageal curlingRosary-beadsheikh kebab configurationChain of bead appearanceDiffuse esophageal spasm 