Abstract
To investigate the location and extent of intraspinal cord lesions, evoked spinal cord potentials (ESCPs) following transcranial electrical stimulation (TE-ESCPs) and median nerve stimulation (MN-ESCPs) were recorded in 9 patients with cervical myelopathy. Comparison of the abnormal lesion in ESCPs and high signal intensity area of the spinal cord on T2-weighted MRI was also investigated.High signal intensity areas on T2W MRI were observed in 6 of 9 patients. In 4 of 6 patients, this area corresponded to the area showing abnormal findings in both TE-ESCPs and MN-ESCPs. In 2 of 6 patients, the lesion confirmed by ESCPs is more extensive than the area revealed by MRI. In these 2 cases, the lesion confirmed by ESCPs was from C4/5 to C5/6 disc level but the high signal intensity area was observed at only C5/6.We concluded that high signal intensity on T2-weighted MRI exactly matched the abnormal disc level confirmed by MN-ESCPs, although this lesion can also include spinal tract lesions (corticospinal tract) observed in TE-ESCPs.
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