<prompt> Radiographic findings of cardiac achalasia include all except:Oesophageal dilatationRat-tail appearanceFailure of lower oesophageal sphincter to relaxDiffuse oesophageal spasm  <response>: In cardiac achalasia, there is lack of lower oesophageal sphincter to relax with consequent dilatation of oesophagus. Radiologically dilated oesophagus and spasm of lower oesophageal sphincter gives a rat-tail or bird-beak appearance. Primary achalasia is associated with idiopathic degeneration of ganglion cells of the Auerbachs plexus.Secondary cardiac achalasia is caused by:i . Carcinoma of distal oesophagusii . Chagas diseaseiii . Post-vagotomy syndromeiv . Cerebrovascular accidentv . Diabetes. 