title: An Isolated Posterior Spinal Aneurysm Resection in Which Intraoperative Electrophysiological Monitoring Was Successfully Used to Locate the Lesion and to Detect the Possibility of Ischemic Complications.
abstract: METHODS
  A case report.
  
  
  OBJECTIVE
  To report the successful use of electrophysiological monitoring in the surgical resection of a ruptured spinal artery (SA) aneurysm to locate the lesion, and to predict ischemic complications.
  
  
  BACKGROUND
  Isolated aneurysm of the posterior SA is an extremely rare event without established treatment and diagnosis procedures. Reports describing the surgical intervention of aneurysm of the posterior SA using electrophysiological monitoring are scant.
  
  
  METHODS
  We performed the surgical resection of a dissected posterior SA aneurysm in an older patient who presented with spinal subarachnoid hemorrhage using intraoperative electrophysiological monitoring.
  
  
  RESULTS
  Intraoperatively, motor evoked potentials decreased over 50% when a distal site of the lesion was clipped, indicating that site was the posterior SA. This lead to further investigation of the vascular anatomy around the lesion, which revealed the descending part of the posterior SA buried deeply in a thick thrombus. Clipping and resection were successful, and ischemia of the posterior SA was avoided. The postoperative clinical course was good, and there was no recurrence or long-term squeal.
  
  
  CONCLUSIONS
  Electrophysiological monitoring might be useful when intraoperative anatomical findings of the hemodynamic structure are inadequate. Moreover, in our case, intraoperative changes in motor evoked potentials indicated the risk to occlude one of posterior SAs, although it is said that posterior circulation of spinal cord has ischemic tolerance.
authors.affiliation: Department of Neurosurgery, Otsu Municipal Hospital, Shiga, Japan.
authors.forename: Megumu
authors.initials: M
authors.lastname: Takata
authors.forename: Motohiro
authors.initials: M
authors.lastname: Takayama
authors.forename: Yohei
authors.initials: Y
authors.lastname: Yokoyama
authors.forename: Hideki
authors.initials: H
authors.lastname: Hayashi
authors.forename: Natsue
authors.initials: N
authors.lastname: Kishida
mesh_terms: D000368:Aged; D000783:Aneurysm / Q000175:diagnosis / Q000601:surgery; D004594:Electrophysiology; D005260:Female; D006801:Humans; D016343:Monitoring, Intraoperative; D011183:Postoperative Complications / Q000517:prevention & control*; D020760:Spinal Cord Ischemia / Q000517:prevention & control*; D013122:Spinal Diseases / Q000175:diagnosis / Q000601:surgery