title: A remnant tooth in an edentulous patient.
abstract: OBJECTIVE
  We describe a case of an unusual remnant tooth located in the paranasal sinus in a head and neck cancer patient.
  
  
  METHODS
  A 72-year patient with a history of T3N2aM0 oropharyngeal cancer treated with chemoradiation came for systematic post-therapeutic multidetector-CT reformation (MDCT) examination. MDCT scan multi planar reformation revealed a well-limited high-density mass in his maxillary sinus, which proved to be a remnant molar tooth. Physical examination and CT imaging were performed at 26 months. Local malignancy, fungal ball and persistent oroantral fistula were ruled out.
  
  
  CONCLUSIONS
  The physio-pathogenesis of oroantral fistula (OAF) and causes of intra sinusal tooth as well as therapy are discussed in this article.
authors.affiliation: Cancer Research Center Antoine-Lacassagne, University Nice Sophia-Antipolis, Department of Radiodiagnostics, 33 avenue Valombrose,06189 Nice cedex 2, France. pierre-yves.marcy@nice.fnclcc.fr
authors.forename: P Y
authors.initials: PY
authors.lastname: Marcy
authors.forename: J
authors.initials: J
authors.lastname: Thariat
authors.forename: A
authors.initials: A
authors.lastname: Lacout
authors.forename: V
authors.initials: V
authors.lastname: Darcourt
authors.forename: K
authors.initials: K
authors.lastname: Benezery
authors.forename: A
authors.initials: A
authors.lastname: Bozec
authors.forename: O
authors.initials: O
authors.lastname: Dassonville
mesh_terms: D000368:Aged; D019229:Dentition, Permanent; D006801:Humans; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging*; D008297:Male; D008963:Molar / Q000000981:diagnostic imaging*; D009959:Oropharyngeal Neoplasms / Q000188:drug therapy / Q000532:radiotherapy; D014057:Tomography, X-Ray Computed