title: Histological evaluation of drill fragments obtained during osteoid osteoma radiofrequency ablation.
abstract: OBJECTIVE
  Osteoid osteoma (OO) is a benign bone tumor diagnosed mainly on the basis of the patient's history and radiological data. Histological evaluation may not be available before treatment. The aim of this study was to assess the diagnostic value of a histological evaluation of the bone fragments obtained during radiofrequency ablation (RFA).
  
  
  METHODS
  During a 2-year period, 39 patients diagnosed clinically with OO were entered into this study. The procedure was performed under computed tomography (CT) guidance. An 11-gauge needle was initially placed as a coaxial guide. After drill removal, RFA was performed. Bone fragments collected from the drill were examined by two experienced pathologists, independently.
  
  
  RESULTS
  There was strong association between pathologists' reports (P <0.001). In 27 cases (69.2%) this diagnosis was confirmed pathologically. No significant relationship was found between nidus diameter and positive histological findings (P = 0.35).
  
  
  CONCLUSIONS
  Histological confirmation of OO based on drill fragments is similarly frequent as previously reported for standard bone biopsy.
authors.affiliation: Noor Medical Imaging Center, Shahid Yosefian St., Motahari St, Tehran, Iran. akhlaghpoor@nmri-ir.com
authors.forename: Shahram
authors.initials: S
authors.lastname: Akhlaghpoor
authors.forename: Alireza
authors.initials: A
authors.lastname: Aziz Ahari
authors.forename: Seyed Ali
authors.initials: SA
authors.lastname: Ahmadi
authors.forename: Abbas
authors.initials: A
authors.lastname: Arjmand Shabestari
authors.forename: Katayoun
authors.initials: K
authors.lastname: Gohari Moghaddam
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Alinaghizadeh
mesh_terms: D000293:Adolescent; D001706:Biopsy / Q000379:methods*; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000601:surgery*; D001842:Bone and Bones / Q000000981:diagnostic imaging / Q000473:pathology*; D017115:Catheter Ablation / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010017:Osteoma, Osteoid / Q000175:diagnosis* / Q000601:surgery*; D025321:Surgery, Computer-Assisted / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome