title: Circumscribed posterior keratoconus.
abstract: BACKGROUND
  Posterior keratoconus is characterized by an internal protrusion of the posterior corneal surface and associated localized or diffuse stromal thinning. Two cases of circumscribed (localized) posterior keratoconus are presented that are representative of the spectrum of the anomaly.
  
  
  CONCLUSIONS
  The clinical and histological appearance of posterior keratoconus and its differential diagnosis from other corneal ectasias and developmental anomalies are reviewed to enable the eye care practitioner to better diagnose and manage this rare anterior segment disorder.
authors.forename: S B
authors.initials: SB
authors.lastname: Eiden
authors.forename: R J
authors.initials: RJ
authors.lastname: Epstein
mesh_terms: D000869:Anterior Eye Segment / Q000473:pathology; D004728:Endothelium, Corneal / Q000473:pathology*; D005260:Female; D006801:Humans; D007640:Keratoconus / Q000473:pathology*; D008875:Middle Aged