Diagnostic value of visual evoked response, clinical eye examination and CSF analysis in chronic myelopathy.

The results of neuro-ophthalmological examination, visual evoked responses (VER) to pattern reversal stimulation and cerebrospinal fluid (CSF) analysis were compared in 25 patients with myelopathy of unknown etiology and without subjective symptoms of involvement of CNS outside the spinal cord. Delayed latencies of VER indicating a disseminated disease were found in 76 per cent of the patients. In 64 per cent of the patients, CSF showed abnormalities similar to those found in MS. Pathological findings at the clinical eye examination consistent with such an etiology was found in 36 per cent of the cases. It is suggested that a large proportion of patients with myelopathy of unknown etiology suffer from a disseminated demyelinating disorder similar to MS. By a combination of neuro-ophthalmological, VER and CSF examinations such as etiology can be established with reasonable certainty, and more troublesome investigations such as myelographies and spinal angiographies may be restricted to patients in whom the etiology still remains unclear.