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ABSTRACT: Two demonstrative cases are presented showing the usefulness of spinal cord monitoring during spinal surgery. Case One was a patient with severe spinal deformity due to neurofibromatosis. In corrective surgery, inadvertent spinal cord compression by sublaminar wiring was detected by the sudden disappearence of spinal cord evoked potentials (SCPs). Prompt removal of the wire prevented serious spinal cord injury. Case Two had a meningioma of the thoracic spinal cord. During surgery, low SCPs increased in amplitude immediately after removal of the tumor. The findings in these two cases suggest that monitoring of SCPs during spinal surgery not only prevents complications caused by mechanical manipulations but also promotes a favorable postoperative neurological recovery.