title: [Sudan staining of impression cytology retinal specimen].
abstract: BACKGROUND
  Long-term silicone oil tamponade may cause increased numbers of vacuoles in the retina. Conventional methods of histological preparation dissolve silicone oil and optically empty spaces are seen.
  
  
  METHODS
  We examined the retinas of 20 human eyes after silicone oil injection. We obtained the material by peripheral retinectomies during vitrectomy for recurrent retinal detachment. The material was prepared by impression cytology. The time between silicone oil injection and vitrectomy was 3-18 months. The non-fixed cell sheets were stained with Sudan III, followed by a counterstaining with hematoxyline.
  
  
  RESULTS
  Sudan III stained silicone oil 1000 mPa orange-yellow. Sudan-III-stained vacuoles in the retina were found in eight eyes with intraocular silicone oil instillation; in five of these eyes an emulsification of silicone oil was observed. The staining of retinal vacuoles seemed to be caused by the presence of silicone oil in the vacuoles.
  
  
  CONCLUSIONS
  Using impression cytology and the Sudan staining procedure, it was possible to stain vacuoles in non-fixed retinal preparations. A long-term silicone oil tamponade induces these vacuoles in the retina, especially if the silicone oil is emulsified. In order to prevent this complication, removal of emulsified silicone oil should be performed as early as possible.
authors.affiliation: Universitäts-Augenklinik Leipzig.
authors.forename: P
authors.initials: P
authors.lastname: Meier
authors.forename: H
authors.initials: H
authors.lastname: Kohlmann
authors.forename: P
authors.initials: P
authors.lastname: Wiedemann
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001391:Azo Compounds; D004396:Coloring Agents; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000139:chemically induced* / Q000473:pathology; D012008:Recurrence; D012160:Retina / Q000187:drug effects* / Q000473:pathology; D012163:Retinal Detachment / Q000473:pathology / Q000601:surgery*; D012827:Silicone Oils / Q000008:administration & dosage / Q000009:adverse effects*; D014617:Vacuoles / Q000187:drug effects / Q000473:pathology; D014821:Vitrectomy / Q000379:methods*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D012827:Silicone Oils; C033006:sudan III
vernacular_title: Sudanfärbung impressionszytologischer Netzhautpräparate.