title: [High-grade osteosarcoma of the maxillary sinus. A case report].
abstract: BACKGROUND
  Osteosarcoma of the jaw (JOS) constituting 5% to 13% of all osteosarcoma is a locally aggressive malignant mesenchymal tumor with high tendency to local recurrence and the ability to produce tumor osteoid. Compared to osteosarcoma of the remaining skeleton (SOS) JOS metastasizes relatively rarely and relatively late. It differs significantly from SOS in its biological behaviour.
  
  
  METHODS
  The presented case deals with a 60-year-old male patient suffering from a newly occurred polypous mucosal tumor of the right-sided maxillary alveolar ridge bioptically diagnosed as a granulation tissue polyp first. After transmaxillary resection of the tumor and consultation of a bone tumor reference center the final diagnosis of a high-grade chondroblastic osteosarcoma could be made. The recommended radical resection of the tumor was declined by the patient because of the expected cosmetic consequences. After surgical reduction of the rapidly growing sarcoma chemotherapy according to the COOS/EURO-B.O.S.S. protocol was initiated at a stage when computed tomography showed diffuse metastatic disease to the lungs. Chemotherapy could delay the progress of the disease only temporarily. The patient died from respiratory insufficiency.
  
  
  CONCLUSIONS
  In JOS radical surgical resection is the therapy of first choice. For substantiation of the diagnosis and central registration of the cases a bone tumor reference center should be contacted.
authors.affiliation: Klinik für Zahn-, Mund-, Kiefer- und Plastische Gesichtschirurgie des Universitätsklinikums der RWTH Aachen, Pauwelsstrasse 30, 52074, Aachen, Germany. Marcus.Geressen@post.rwth-aachen.de
authors.forename: Marcus
authors.initials: M
authors.lastname: Gerressen
authors.forename: Andreas
authors.initials: A
authors.lastname: Donner
authors.forename: Gernot
authors.initials: G
authors.lastname: Jundt
authors.forename: Siegfried
authors.initials: S
authors.lastname: Jänicke
authors.forename: Ralf
authors.initials: R
authors.lastname: Smeets
authors.forename: Dieter
authors.initials: D
authors.lastname: Riediger
authors.forename: Alireza
authors.initials: A
authors.lastname: Ghassemi
mesh_terms: D000539:Alveolar Process / Q000473:pathology / Q000601:surgery*; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001706:Biopsy; D017024:Chemotherapy, Adjuvant; D003937:Diagnosis, Differential; D018450:Disease Progression; D005500:Follow-Up Studies; D006801:Humans; D008175:Lung Neoplasms / Q000556:secondary; D008297:Male; D008444:Maxillary Sinus Neoplasms / Q000175:diagnosis / Q000188:drug therapy / Q000473:pathology / Q000601:surgery*; D008875:Middle Aged; D012516:Osteosarcoma / Q000175:diagnosis / Q000188:drug therapy / Q000473:pathology / Q000601:surgery*; D014057:Tomography, X-Ray Computed