title: [Percutaneous CT guided radio-frequency ablation of osteoid osteoma and osteoblastoma].
abstract: BACKGROUND
  Osteoid osteoma (OO) is a benign osteoblastic bone lesion that causes severe local pain mainly at night, and usually responds to oral administration of NSAID. The lesion is located around the proximal thigh in more than 50% of the cases. Osteoblastoma is similar to OO in their histopathology features, but emerges frequently in the spine, and has a larger diameter than OO. Percutaneous CT-guided radiofrequency ablation (RFA) is becoming the treatment of choice for osteoid osteoma and non-aggressive osteoblastoma in the last decade.
  
  
  METHODS
  During the period 2005-2009, 38 patients were diagnosed with osteoid osteoma (n = 34), and osteoblastoma (n = 4). A total of 34 patients were treated with RFA using a water-cooled, variable ablation size tip. Two patients underwent an open procedure, and 2 had spontaneous remission.
  
  
  RESULTS
  Thirty three patients (97%) reported complete remission of their pain after a single treatment; one patient needed a second RFA treatment, and reported full remission of his symptoms after the 2nd treatment.
  
  
  CONCLUSIONS
  Percutaneous CT-guided radiofrequency ablation of osteoid osteoma and non-aggressive osteoblastoma is simple, safe, and reliable. Meticulous placement of the probe inside the tumor, and the usage of water-cooled, variable ablation size tip, improves the overall outcome and decrease complication rates.
authors.affiliation: 0rthopedic Oncology Service, Chaim Sheba Medical Center, Tel Hashomer Israel. boaz.liberman@sheba.health.gov.il
authors.forename: Boaz
authors.initials: B
authors.lastname: Liberman
authors.forename: Alexander
authors.initials: A
authors.lastname: Gerniak
authors.forename: Iris
authors.initials: I
authors.lastname: Eshed
authors.forename: Ahron
authors.initials: A
authors.lastname: Chechick
authors.forename: Israel
authors.initials: I
authors.lastname: Weiss
authors.forename: Noga
authors.initials: N
authors.lastname: Shabshin
mesh_terms: D001859:Bone Neoplasms / Q000473:pathology / Q000601:surgery*; D017115:Catheter Ablation / Q000009:adverse effects / Q000379:methods*; D006801:Humans; D018215:Osteoblastoma / Q000473:pathology / Q000601:surgery*; D010017:Osteoma, Osteoid / Q000473:pathology / Q000601:surgery*; D010146:Pain / Q000209:etiology / Q000601:surgery; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water