Thecal deformity after lumbar myelography with iophendylate (Myodil) and meglumine iothalamate (Conray 280).

A study of repeat myelograms carried out in 93 patients revealed that the incidence of thecal scarring following Conray lumbar radiculography is high (61% of all cases), and only slightly lower than that found after Myodil myelography (74%). Possible factors affecting the incidence of arachnoiditis and the radiological and clinical significance of this condition are considered.