title: Ultrasound findings in orbital hydatid cysts.
abstract: OBJECTIVE
  To describe the ultrasound features seen in orbital hydatid disease, which may confirm the diagnosis preoperatively.
  
  
  METHODS
  Interventional case series.
  
  
  METHODS
  Nine patients of orbital hydatid cyst were evaluated preoperatively with ultrasound and computed tomography scans. The diagnostic features seen on ultrasound as well as the CT features are described. All patients underwent surgery to remove the cyst, and the diagnosis was confirmed surgically in all nine cases.
  
  
  RESULTS
  We found that ultrasound was most helpful in diagnosing a hydatid cyst, even more so than a computed tomography scan, and we saw a diagnostic "double wall" sign in all cases, on ultrasound, a sign not previously described in orbital hydatids.
  
  
  CONCLUSIONS
  It is difficult to diagnose an orbital hydatid cyst preoperatively. However, we found that the double wall sign could be elicited ultrasonically in all cases of hydatid cyst, if looked for carefully, and the diagnosis could be confirmed.
authors.affiliation: Oculoplasty Service, Dr. Rajendra Prasad Center for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. subhash_bethria@yahoo.co.in
authors.forename: S M
authors.initials: SM
authors.lastname: Betharia
authors.forename: Vidushi
authors.initials: V
authors.lastname: Sharma
authors.forename: Neelam
authors.initials: N
authors.lastname: Pushker
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004443:Echinococcosis / Q000000981:diagnostic imaging* / Q000601:surgery; D015822:Eye Infections, Parasitic / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009916:Orbital Diseases / Q000000981:diagnostic imaging* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography