primary hydatid cyst of the right maxillary sinus: a case report

introduction: a hydatid cyst of the head and neck is a very rare condition, even in areas where echinococcus infestation is endemic.   case report: 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.   conclusion: 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.