title: Comparison of transillumination and histologic slide measurements of choroidal melanoma.
abstract: OBJECTIVE
  To compare transillumination and histologic slide measurements of choroidal melanomas in 479 eyes randomized to enucleation in the Collaborative Ocular Melanoma Study.
  
  
  METHODS
  Transillumination defects were measured during gross examination of enucleated eyes. Tumor basal diameter and height were measured on histologic slides and each tumor was assigned to 1 of 8 distinct shape categories. Comparison of the transillumination and histologic slide measurements revealed 3 categories of difference: underestimation (transillumination measurement more than 4 mm smaller than the histologic slide measurement), overestimation (transillumination measurement more than 4 mm larger than the histologic slide measurement), and agreement within 4 mm.
  
  
  RESULTS
  There was good correlation between transillumination and histologic slide estimates of largest basal diameter, particularly when the basal diameter was 16 mm or less. Measurement discrepancies were related to the shape of the tumors but not to the presence of subretinal fluid or fixation.
  
  
  CONCLUSIONS
  Agreement was high between measurements of transillumination defect and histologic sections.
authors.affiliation: Department of Ophthalmology, Tufts/New England Medical Center Hospitals, Boston, Mass, USA.
authors.forename: J
authors.initials: J
authors.lastname: Umlas
authors.forename: M
authors.initials: M
authors.lastname: Diener-West
authors.forename: N L
authors.initials: NL
authors.lastname: Robinson
authors.forename: W R
authors.initials: WR
authors.lastname: Green
authors.forename: H E
authors.initials: HE
authors.lastname: Grossniklaus
authors.forename: D M
authors.initials: DM
authors.lastname: Albert
mesh_terms: D001918:Brachytherapy; D002830:Choroid Neoplasms / Q000473:pathology* / Q000628:therapy*; D015353:Eye Enucleation; D006801:Humans; D008545:Melanoma / Q000473:pathology* / Q000628:therapy*; D010336:Pathology / Q000379:methods