Anaesthesia in patients with malformative and degenerative abnormalities of cervical spine poses a number of specific problems. A crucial point is the indispensable evaluation and observation before and during anaesthesia. Somatosensory evoked potentials being used to monitor nervous system pathways at risk during surgical procedures the effect of anaesthetic agents on these parameters are to be well known. Some pathologies are liable to per and postoperative specific risks breeding complications.