IntroductionMyelopathy is an uncommon disease in electrocution aggressions. The predominant clinical expression of this neurological process is gait disorder accompanied by significant pyramidalism. It is generally immediate, although some patients, for unknown reasons, develop it after a symptom-free period. Due to the semiological similarities and prognostic connotations, it should be distinguished from motor-neuron disease. Clinical caseA 33-year old man who suffered severe electrocution and who, after 6 months without motor symptoms, presented with a gait disorder without association of pain and with significant data of pyramidal involvement of the limbs. The cranial and cervical neuroimages were normal. The neurophysiological study, including transcranial magnetic stimulation, confirmed the diagnosis of cervical myelopathy and made the participation of a dysfunction of the second motor neuron unlikely. DiscussionWe present the case of a patient with post-electrocution delayed myelopathy. The transcranial magnetic stimulation study helped to better determine the pathophysiological characteristics of the disease, also confirming the diagnostic efficiency in the discrimination of the focal lesions. The differential diagnosis with motor-neuron disease is essential due to the semiology they share. Thus, good knowledge of the criteria on which the diagnosis is made is recommendable.