title: Pellucid marginal degeneration with superior corneal thinning.
abstract: OBJECTIVE
  Pellucid marginal degeneration is a noninflammatory thinning disorder typically involving the inferior cornea. We describe a patient with superior corneal thinning similar to classic pellucid marginal degeneration.
  
  
  METHODS
  An 80-year-old man was evaluated for high astigmatism.
  
  
  RESULTS
  The right superior cornea had a prominent band of thinning with ectasia. Both inferior corneas had characteristic zones of thinning without inflammation.
  
  
  CONCLUSIONS
  Superior pellucid marginal corneal degeneration should be considered in the differential diagnosis of superior corneal ectatic disorders.
authors.affiliation: Department of Ophthalmology, University of Pittsburgh Medical Center, Pennsylvania 15213, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: Bower
authors.forename: D K
authors.initials: DK
authors.lastname: Dhaliwal
authors.forename: D A
authors.initials: DA
authors.lastname: Barnhorst
authors.forename: J
authors.initials: J
authors.lastname: Warnicke
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000175:diagnosis / Q000628:therapy; D003315:Cornea / Q000473:pathology*; D003317:Corneal Dystrophies, Hereditary / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005139:Eyeglasses; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D014792:Visual Acuity