title: Primary hydatid cyst of the right maxillary sinus: a case report.
abstract: BACKGROUND
  A hydatid cyst of the head and neck is a very rare condition, even in areas where Echinococcus infestation is endemic.
  
  
  METHODS
  We report a rare case of primary hydatid cyst of the right maxillary sinus in a 40-year-old man. The initial diagnosis of the presence of a cystic mass was the result of physical examination and computed tomography (CT) scan. We resected the cystic mass using the Caldwell-Luc procedure. A definitive diagnosis was confirmed by postoperative histopathologic examination.
  
  
  CONCLUSIONS
  Hydatid cyst of the maxillary sinus is an extremely rare presentation. However, this condition should be considered in differential diagnosis of cystic lesions of the maxillary sinus.
authors.affiliation: Department of Otorhinolaryngology, Imam Hospital, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Ali Reza
authors.initials: AR
authors.lastname: Lotfi
authors.affiliation: Department of General and Vascular Surgery, Imam Reza Hospital, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Sina
authors.initials: S
authors.lastname: Zarrintan
authors.affiliation: Department of Otorhinolaryngology, Imam Hospital, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Naderpour
authors.affiliation: Department of Otorhinolaryngology, Imam Hospital, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Sokhandan
authors.affiliation: Department of Pathology, Imam Hospital, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Ashraf
authors.initials: A
authors.lastname: Fakhrjou
authors.affiliation: Department of General and Vascular Surgery, Imam Reza Hospital, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Amrollah
authors.initials: A
authors.lastname: Bayat
authors.affiliation: Department of Neurosurgery, Imam Hospital, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Firouz
authors.initials: F
authors.lastname: Salehpour
authors.forename: Hamid
authors.initials: H
authors.lastname: Djalilian
keywords: Cystic lesion; Echinococcus; Hydatid cyst; Maxillary sinus; Maxillofacial