<prompt> The contrast material used in the diagnosis of esophageal atresia isGastrograffinConray 420DianosilMyodii  <response>: Dianosil is used in oesophageal atresia, as in most cases it is frequently associated with tracheo-oesophageal fistula; so on instillation of contrast media, there is a risk of flooding in the lungs. 