TEMPORARY LOSS OF INTRAOPERATIVE MOTOR-EVOKED POTENTIAL AND PERMANENTLOSS OF SOMATOSENSORY-EVOKED POTENTIALS ASSOCIATED WITH A POSTOPERATIVE SENSORY DEFICIT

We describe a case of the temporary loss of right popliteal fossa intr aoperative neurogenic motor-evoked potential and the permanent loss of right median and ulnar somatosensory-evoked potentials (SSEPs) with r etention of posterior tibial (SSEPs) during intramedullary spinal cord surgery in a 28-year-old man. Postoperatively, the patient had preser ved motor function in all extremities and loss of proprioception, two- point discrimination, and vibration in his right upper extremity. The complementary and beneficial use of intraoperative monitoring of both motor-evoked potentials and SSEPs during spinal cord surgery is discus sed.