title: [Chondrosarcoma of the sphenoethmoid complex: Case report].
abstract: BACKGROUND
  Chondrosarcomas are rare malignant mesenchymal tumors of unknown etiology. Only 5 to 10 % appear in the head and neck region.
  
  
  RESULTS
  We report the case of a 63 year old woman with a chondrosarcoma of the sphenoethmoidal complex extending into the anterior cranial fossa. The tumor was subtotally resected via an osteoplastic lateral rhinotomy. Postoperatively, a fractionated radiation therapy with carbon ions (Schwerionen) was applied. There was no evidence of recurrence one year after therapy.
  
  
  CONCLUSIONS
  Recent prognostic improvements of skull base chondrosarcomas by combination of skull base surgery and innovative radiation therapy are discussed and the literature is presented.
authors.affiliation: Klinik und Poliklinik für Hals-, Nasen- und Ohrenkrankheiten Universitätsklinikum Münster, Germany. kroemer@uni-muenster.de
authors.forename: J H
authors.initials: JH
authors.lastname: Krömer
authors.forename: K
authors.initials: K
authors.lastname: Ludwig
authors.forename: H
authors.initials: H
authors.lastname: Bürger
authors.forename: J
authors.initials: J
authors.lastname: Alberty
mesh_terms: D002455:Cell Division / Q000502:physiology; D002813:Chondrosarcoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D004724:Endoscopy; D005005:Ethmoid Sinus / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D010255:Paranasal Sinus Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D019292:Skull Base Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D013101:Sphenoid Sinus / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed