[Post-operative lumbar myelogram. Morphology and indications for repeat examinations in patients with disc prolapse...

The morphology and indications for performing post-operative contrast examinations have been analysed in 131 myelograms. Leptomeningeal reactions and adhesions were found in varying degrees of severity in 34 to 75% of post-operative cases; it proved difficult to correlate this finding with the neurological features. The value of repeat myelograms is much reduced after surgery or after previous contrast examinations. It is probable that this is due in part to tissue changes resulting from the surgery or from a proliferative reaction induced by the contrast medium.