title: Idiopathic bilateral antral exostoses: A rare case in maxillary sinus.
abstract: BACKGROUND
  Exostoses in paranasal sinuses have been reported in the otolaryngology literature, but they have not been described in the dental literature to our knowledge. The aim of this article is to describe an idiopathic and rare case of bilateral exostosis obtained by cone-beam computed tomography.
  
  
  METHODS
  The case shows a healthy and asymptomatic patient with a different size and form of exostoses in both maxillary sinuses.
  
  
  CONCLUSIONS
  It is difficult to clinically diagnose the antral exostosis due the asymptomatic nature of this condition, unless the approach would be through endoscope. Sometimes this condition is related with nasal irrigants, however in this case the patient asserted not having used nasal irrigation ever; thus, it is impossible to relate this kind of treatment as a principal cause.
  
  
  CONCLUSIONS
  The published data of exostoses in maxillary sinus seem to be limited in the dental literature, and this condition is important to consider in an implant treatment planning. Also, it is important to perform a follow-up of the cases in trying to find the possible causes of exostosis.
authors.affiliation: Dental School, Universidad de La Frontera, Temuco, Chile; Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil. Electronic address: eduardo.borie@ufrontera.cl.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Borie
authors.affiliation: Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Plauto C A
authors.initials: PC
authors.lastname: Watanabe
authors.affiliation: Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Iara A
authors.initials: IA
authors.lastname: Orsi
authors.affiliation: Dental School, Universidad de La Frontera, Temuco, Chile.
authors.forename: Ramón
authors.initials: R
authors.lastname: Fuentes
keywords: Cone-beam computed tomography; Exostoses; Maxillary sinus