title: External versus internal approach to the removal of metallic intraocular foreign bodies.
abstract: OBJECTIVE
  To review the management of metallic intraocular foreign bodies (IOFB) at a single institution and to compare the use of internal and external approaches for their removal.
  
  
  METHODS
  A retrospective review was conducted on 70 eyes from 70 patients who underwent surgical removal of a metallic IOFB with either an internal (vitrectomy followed by forceps or internal magnet use) or external approach (large electromagnet) by seven vitreoretinal surgeons at a single institution between 1973 and 1996. Visual acuity and complications occurring with the two approaches were the main outcome measures studied.
  
  
  RESULTS
  Overall, patients showed significant improvement in visual acuity following surgical intervention (P < 0.001) despite widely varying surgical techniques. When the authors compared patients treated with an external versus an internal approach they found no statistically significant difference with regard to visual outcome and a trend toward a higher rate of postoperative endophthalmitis in the external approach group.
  
  
  CONCLUSIONS
  Surgical removal of metallic IOFB results in significant visual improvement. The external approach to the removal of magnetic metallic IOFB remains a viable treatment option in select cases.
authors.affiliation: Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
authors.forename: D R
authors.initials: DR
authors.lastname: Chow
authors.forename: B R
authors.initials: BR
authors.lastname: Garretson
authors.forename: B
authors.initials: B
authors.lastname: Kuczynski
authors.forename: G A
authors.initials: GA
authors.lastname: Williams
authors.forename: R
authors.initials: R
authors.lastname: Margherio
authors.forename: M S
authors.initials: MS
authors.lastname: Cox
authors.forename: M T
authors.initials: MT
authors.lastname: Trese
authors.forename: T
authors.initials: T
authors.lastname: Hassan
authors.forename: P
authors.initials: P
authors.lastname: Ferrone
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D065306:Corneal Injuries; D005129:Eye Foreign Bodies / Q000473:pathology / Q000601:surgery*; D015807:Eye Injuries, Penetrating / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D007908:Lens, Crystalline / Q000293:injuries / Q000601:surgery; D008280:Magnetics / Q000627:therapeutic use*; D008297:Male; D008670:Metals; D008875:Middle Aged; D011379:Prognosis; D012160:Retina / Q000293:injuries / Q000473:pathology; D012189:Retrospective Studies; D014792:Visual Acuity; D014821:Vitrectomy / Q000379:methods*
chemical_list: D008670:Metals