title: Radiofrequency thermal ablation for recurrent meningioma extending extracranially.
abstract: BACKGROUND
  Image-guided and temperature-controlled radiofrequency thermal ablation techniques were applied to reduce tumor volume and relieve the symptoms caused by extracranial extension of recurrent meningioma.
  
  
  METHODS
  We treated two patients with recurrent meningioma, an 81-year-old woman presenting with bulging of the temple and a 68-year-old woman presenting with visual disturbance, facial disfigurement, and sensory disturbance. Neuroimaging in both patients, revealed a large tumor extending extracranially and involving the infratemporal fossa. To avoid injury to important anatomical structures either compressed or entrapped by the tumor, the spatial relation between the planned ablation volume and these structures was confirmed by 3-D reconstruction of the ablation target. During the ablation procedure, local temperatures over the tissue being cauterized were continuously monitored to limit the ablation area to that within the planned volume adjusting RF power.
  
  
  RESULTS
  Radiofrequency ablation produced tumor necrosis as planned without adverse effects and resulted in swift relief of symptoms and signs with shrinkage of the tumor.
  
  
  CONCLUSIONS
  This technique may be an effective alternative for recurrent meningiomas extending extracranially and for which radical surgical procedures are not indicated.
authors.affiliation: Department of Neurosurgery, Osaka University Medical School, Japan. akato@nsurg.med.osaka-u.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Kato
authors.forename: Y
authors.initials: Y
authors.lastname: Fujimoto
authors.forename: N
authors.initials: N
authors.lastname: Hashimoto
authors.forename: M
authors.initials: M
authors.lastname: Taniguchi
authors.forename: M
authors.initials: M
authors.lastname: Kinoshita
authors.forename: A
authors.initials: A
authors.lastname: Hirayama
authors.forename: M
authors.initials: M
authors.lastname: Maruno
authors.forename: T
authors.initials: T
authors.lastname: Yoshimine
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D017115:Catheter Ablation / Q000379:methods*; D005094:Exophthalmos / Q000209:etiology / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008577:Meningeal Neoplasms / Q000473:pathology / Q000601:surgery*; D008579:Meningioma / Q000473:pathology / Q000601:surgery*; D009364:Neoplasm Recurrence, Local / Q000473:pathology / Q000601:surgery*; D009918:Orbital Neoplasms / Q000556:secondary / Q000601:surgery; D010255:Paranasal Sinus Neoplasms / Q000556:secondary / Q000601:surgery; D012886:Skull / Q000473:pathology / Q000601:surgery; D019292:Skull Base Neoplasms / Q000473:pathology / Q000601:surgery*; D025321:Surgery, Computer-Assisted / Q000379:methods; D016896:Treatment Outcome