<prompt> A 30 year old female patient presents with nonprogressive dysphagia, for both solids and liquids. The characteristic finding on barium swallow that will confirm the probable diagnosis isDilated esophagus with narrow lower end Rat tail esophagusMultiple sacculations and pseudodiveiculae Corkscrew esophagusNarrow and irregular esophageal lumenStricture ulcer in the esophagus  <response>: Options a b indicate motility disorders, c d indicates mechanical causes of obstruction.Dysphagia for both solids and liquids suggest motility disorder whereas solids more than liquids suggest mechanical obstruction.Dysphagia due to diffuse esophageal spasm is nonprogressive and due to achalasiadilated esophagus with rat tail appearance is progressive.Ref: Harrisons 18e p2432, 16e p1742 CMDT 2013 p592 