title: Histopathologic findings in congenital grouped pigmentation of the retina.
abstract: BACKGROUND
  Congenital grouped pigmentation of the retina is a condition characterized by multiple, well-circumscribed, flat, pigmented fundus lesions clustered in a fashion resembling "bear tracks."
  
  
  METHODS
  Light and electron microscopy was used to study these lesions in an eye of a 2-year-old boy. The eye was enucleated for retinoblastoma.
  
  
  RESULTS
  Similar to the classic, solitary, congenital hypertrophy of the retinal pigment epithelium (CHRPE), the involved RPE cells contained an increased number of large pigment granules. Unlike CHRPE, most pigment granules retained the normal ellipsoidal shape. In addition, hypertrophy and hyperplasia of the RPE cells were not significant features by light and electron microscopy.
  
  
  CONCLUSIONS
  Although the lesions in this case superficially resembled CHRPE by light microscopy, ultrastructural differences were identified.
authors.affiliation: Department of Pathology, Wills Eye Hospital, Thomas Jefferson University, Philadelphia, PA 19107.
authors.forename: C D
authors.initials: CD
authors.lastname: Regillo
authors.forename: R C
authors.initials: RC
authors.lastname: Eagle
authors.forename: J A
authors.initials: JA
authors.lastname: Shields
authors.forename: C L
authors.initials: CL
authors.lastname: Shields
authors.forename: V V
authors.initials: VV
authors.lastname: Arbizo
mesh_terms: D002675:Child, Preschool; D015353:Eye Enucleation; D006801:Humans; D006984:Hypertrophy; D008297:Male; D008544:Melanocytes / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D010857:Pigment Epithelium of Eye / Q000648:ultrastructure; D012174:Retinitis Pigmentosa / Q000151:congenital* / Q000473:pathology*; D012175:Retinoblastoma / Q000473:pathology