title: Osteoid osteomas in common and in technically challenging locations treated with computed tomography-guided percutaneous radiofrequency ablation.
abstract: OBJECTIVE
  To evaluate the efficacy of computed tomography (CT)-guided radiofrequency (RF) ablation for the treatment of osteoid osteomas in common and in technically challenging locations.
  
  
  METHODS
  Twenty-three patients with osteoid osteomas in common (nine cases) and technically challenging [14 cases: intra-articular (n = 7), spinal (n = 5), metaphyseal (n = 2)] positions were treated with CT-guided RF ablation. Therapy was performed under conscious sedation with a seven-array expandable RF electrode for 8-10 min at 80-110 degrees C and power of 90-110 W. The patients went home under instruction. A brief pain inventory (BPI) score was calculated before and after (1 day, 4 weeks, 6 months and 1 year) treatment.
  
  
  RESULTS
  All procedures were technically successful. Primary clinical success was 91.3% (21 of total 23 patients), despite the lesions' locations. BPI score was dramatically reduced after the procedure, and the decrease in BPI score was significant (P < 0.001, paired t-test; n-1 = 22) for all periods during follow up. Two patients had persistent pain after 1 month and were treated successfully with a second procedure (secondary success rate 100%). No immediate or delayed complications were observed.
  
  
  CONCLUSIONS
  CT-guided RF ablation is safe and highly effective for treatment of osteoid osteomas, even in technically difficult positions.
authors.affiliation: Red Cross Hospital Korgialenio -Benakio, Athens, Greece. mylonasophia@yahoo.com
authors.forename: Sophia
authors.initials: S
authors.lastname: Mylona
authors.forename: Sofia
authors.initials: S
authors.lastname: Patsoura
authors.forename: Panagiota
authors.initials: P
authors.lastname: Galani
authors.forename: Georgios
authors.initials: G
authors.lastname: Karapostolakis
authors.forename: Anastasia
authors.initials: A
authors.lastname: Pomoni
authors.forename: Loukas
authors.initials: L
authors.lastname: Thanos
mesh_terms: D000293:Adolescent; D000328:Adult; D001859:Bone Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery*; D017115:Catheter Ablation / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010017:Osteoma, Osteoid / Q000000981:diagnostic imaging* / Q000601:surgery*; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D016896:Treatment Outcome; D014463:Ultrasonography; D055815:Young Adult