title: Posterior vitreoschisis. An echographic finding in proliferative diabetic retinopathy.
abstract: OBJECTIVE
  To describe the echographic characteristics of splitting the outer posterior cortical vitreous in patients with proliferative diabetic retinopathy and vitreous hemorrhage.
  
  
  METHODS
  The authors retrospectively reviewed the echographic findings in 270 patients who were evaluated at the Doheny Eye Institute between January 1983 to December 1989 for proliferative diabetic retinopathy and vitreous hemorrhage. None of the eyes had undergone pars plana vitrectomy before echographic examination.
  
  
  RESULTS
  Forty-five patients (17%) had echographic evidence of splitting of the outer posterior vitreous cortex, a finding the authors have termed posterior vitreoschisis. In all patients, differentiation of the posterior vitreoschisis from a true posterior hyaloid detachment was possible, either on the initial or on serial echographic examination, by the separate detachment of the inner wall of the vitreoschisis cavity and the true posterior hyaloid from the retinal surface. The vitreoschisis cavities often were found to contain unclotted blood. In some eyes, the inner wall of the vitreoschisis cavity was adherent to the apex of the most highly elevated area of traction retinal detachment, suggesting that posterior vitreoschisis may itself result in clinically significant vitreoretinal traction, independent of the presence or extent of true posterior hyaloid separation.
  
  
  CONCLUSIONS
  The authors' finding suggest that spontaneous splitting of the outer posterior vitreous cortex may occur in patients with proliferative diabetic retinopathy and vitreous hemorrhage, which may mimic a true posterior cortical vitreous detachment on echographic examination. Preoperative recognition of posterior vitreoschisis may be important in the surgical management of these patients.
authors.affiliation: Doheny Eye Institute, Los Angeles, CA 90033, USA.
authors.forename: T G
authors.initials: TG
authors.lastname: Chu
authors.forename: P F
authors.initials: PF
authors.lastname: Lopez
authors.forename: M R
authors.initials: MR
authors.lastname: Cano
authors.forename: W R
authors.initials: WR
authors.lastname: Freeman
authors.forename: J S
authors.initials: JS
authors.lastname: Lean
authors.forename: P E
authors.initials: PE
authors.lastname: Liggett
authors.forename: E L
authors.initials: EL
authors.lastname: Thomas
authors.forename: R L
authors.initials: RL
authors.lastname: Green
mesh_terms: D000328:Adult; D000368:Aged; D003922:Diabetes Mellitus, Type 1 / Q000150:complications; D003930:Diabetic Retinopathy / Q000150:complications* / Q000000981:diagnostic imaging; D005128:Eye Diseases / Q000150:complications / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014463:Ultrasonography; D014822:Vitreous Body / Q000000981:diagnostic imaging*; D014823:Vitreous Hemorrhage / Q000150:complications