<prompt> Contrast media of choice for myelogram isUrografin 75Conray 470lohexolBiligrafin  <response>: C i.e. lohexol - Dianosil is used in oesophageal atresiaQ, as in most cases it is frequently associated with tracheooesophageal fistula; so on instillation of contrast media, there is risk of flooding in the lungs. Water soluble-nonionic LOCM are licenced for intrathecal use eg Iohexol omnipaque and Iopamidol neopamQ and are contrast agents of choice for myelographyQ. These are non neurotoxic, donot cause epileptic fits, can be used without withdrawing other drugs are devoid of arachioid toxicity and anticonvulsant cover is unnecessary. Whereas ionic contrast media both HOCM LOCM are very very toxic often fatal when injected into subarachnoid space. 