A case of cauda equina claudication with canal stenosis is presented. Neurophysiological studies show reversible changes during symptomatic and asymptomatic phases. The somatosensory evoked potential from the tibial nerve was reduced in amplitude. Central motor conduction time (CMCT) after transcranial magnetic stimulation of the brain was reversibly prolonged in the symptomatic phase. Reversible CMCT changes have not been previously shown. The findings are discussed in the light of the pathophysiology of ischaemic nerve.
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