title: Image-guided sphenoid wing meningioma resection and simultaneous computer-assisted cranio-orbital reconstruction: technical case report.
abstract: OBJECTIVE
  Resection of large intraosseous sphenoid wing meningiomas is traditionally associated with significant morbidity. Rapid prototyping techniques have become widely used for treatment planning. Yet, the transfer of a treatment plan into the intraoperative situs strongly depends on the experience of the individual surgeon.
  
  
  METHODS
  Extensive resection with orbital decompression was planned and performed on the basis of rapid prototyping and surgical navigation techniques in a 44-year-old woman presenting with a large sphenoid wing meningioma on the right infiltrating the orbit.
  
  
  RESULTS
  Tumor resection was simulated on a stereolithography model of the patient's head. The stereolithography model was scanned using computed tomography (CT) and the defect geometry was used to create a custom-made titanium implant. The implant consisted of a solid titanium core and a spot-welded titanium mesh surrounding the core, allowing for minor intraoperative adjustments of the implant size by reducing the mesh size. The stereolithography model with the incorporated implant was CT scanned again and the CT data were fused with the patient's original CT data. The implant borders indicating the resection borders were marked within the patient's CT data set. This treatment plan was transferred to an optical navigation system. Intraoperatively, tumor resection was performed using surgical navigation.
  
  
  CONCLUSIONS
  In the presented case report, the combination of computer-assisted planning using rapid prototyping techniques and image-guided surgery allowed for an extensive tumor resection precisely according to a preoperative treatment plan in a patient presenting with a large intraosseous sphenoid wing meningioma. A larger clinical series with a long-term follow-up period will be needed to determine the reproducibility.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Tübingen University Hospital, Tübingen, Germany. Carsten.Westendorff@med.uni-tuebingen.de
authors.forename: Carsten
authors.initials: C
authors.lastname: Westendorff
authors.forename: Jan
authors.initials: J
authors.lastname: Kaminsky
authors.forename: Ulrike
authors.initials: U
authors.lastname: Ernemann
authors.forename: Siegmar
authors.initials: S
authors.lastname: Reinert
authors.forename: Jürgen
authors.initials: J
authors.lastname: Hoffmann
mesh_terms: D000328:Adult; D017076:Computer-Aided Design; D005260:Female; D005626:Frontal Sinus / Q000601:surgery; D006801:Humans; D008577:Meningeal Neoplasms / Q000601:surgery*; D008579:Meningioma / Q000601:surgery*; D009364:Neoplasm Recurrence, Local / Q000601:surgery*; D009915:Orbit / Q000601:surgery; D019736:Prostheses and Implants; D019919:Prosthesis Implantation / Q000379:methods*; D019651:Plastic Surgery Procedures / Q000379:methods*; D025321:Surgery, Computer-Assisted / Q000379:methods; D014025:Titanium; D014057:Tomography, X-Ray Computed
chemical_list: D014025:Titanium