title: Orbital hydatid cyst with diverse locality in the orbit and review of literatures.
abstract: OBJECTIVE
  to introduce five different type of orbital involvement by hydatid cyst in 8 consecutive patients.
  
  
  METHODS
  descriptive case series.
  
  
  METHODS
  Herein 8 patients with slowly progressive proptosis from 2 to 4months earlier at their first presentation are introduced. Complete ophthalmic examinations were done. Complete blood count, serologic test, ESR (erythrocyte sedimentation rate), CT scan and MRI were requested. Surgical removal of the lesions performed in all patients.
  
  
  RESULTS
  The hydatid cysts found in the extraconal (2 patients) and intraconal space (3 patients), lacrimal gland (1 patient), medial rectus (1 patient) and intraosseous of orbital wall (1 patient). The diagnosis of the isolated orbital hydatid cyst without any lesion in other parts of the body was confirmed in all patients. The recurrence was not observed in any patients during 2 - 6 years follow up.
  
  
  CONCLUSIONS
  Although the most common site of involvement of orbital hydatid cyst is intraconal, it can invade various locations within the orbit.
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran. ft1_bazvand@yahoo.com.
authors.forename: Mohammad Taher
authors.initials: MT
authors.lastname: Rajabi
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Bazvand
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Makateb
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Simindokht
authors.initials: S
authors.lastname: Hosseini
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Seyed Ziaeddin
authors.initials: SZ
authors.lastname: Tabatabaie
authors.affiliation: Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad Bagher
authors.initials: MB
authors.lastname: Rajabi
mesh_terms: D000293:Adolescent; D000328:Adult; D004443:Echinococcosis / Q000175:diagnosis / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009916:Orbital Diseases / Q000175:diagnosis / Q000469:parasitology* / Q000601:surgery; D012189:Retrospective Studies; D055815:Young Adult