title: Intraoperative use of a gamma probe for the treatment of condylar hyperplasia: description of a new technique.
abstract: OBJECTIVE
  The purpose of this article is to describe a new technique to perform a high condylectomy using a γ-probe.
  
  
  METHODS
  A 15-year-old female patient presented with right condylar hyperplasia. Because the condition was active, a high condylectomy was performed to stop the abnormal growth of the affected condyle. To resect an adequate amount of bone and prevent relapse, a γ-probe was used to guide bone removal. The patient was injected with technetium-99m methylene diphosphate 25 mCi 2 hours before she was brought to the operating room. Bone was removed from the superior aspect of the right condyle until the reading with the γ-probe was equivalent to normal bone.
  
  
  RESULTS
  Seven millimeters of bone was removed from the top of the condyle before the γ-emission from the remaining condyle was equivalent to the mandibular parasymphysis used as a control. No relapse was noted 9 months after surgery.
  
  
  CONCLUSIONS
  The γ-probe may help a surgeon remove the correct amount of bone when performing a high condylectomy, especially in type II (vertical pattern) condylar hyperplasia.
authors: Department of Oral and Maxillofacial Surgery, School of Dental Medicine, Centre Hospitalier Universitaire de Québec, Pavillon Hôpital de l'Enfant-Jésus, Université Laval. carl.bouchard@fmd.ulaval.ca
authors: Carl
authors: C
authors: Bouchard
authors: Melinda
authors: M
authors: Paris
authors: Jean-Marc
authors: JM
authors: Villemaire
mesh_terms: D000293:Adolescent; D004164:Diphosphonates; D005146:Facial Asymmetry / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D005720:Gamma Rays / Q000627:therapeutic use; D006801:Humans; D006965:Hyperplasia / Q000000981:diagnostic imaging / Q000532:radiotherapy / Q000601:surgery; D007432:Intraoperative Period; D008335:Mandibular Condyle / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008336:Mandibular Diseases / Q000000981:diagnostic imaging / Q000532:radiotherapy / Q000601:surgery*; D015609:Organotechnetium Compounds; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D011877:Radionuclide Imaging
chemical_list: D004164:Diphosphonates; D015609:Organotechnetium Compounds; C114890:technetium 99m methylene bisphosphonate