title: Fluorescence investigations to classify malignant laryngeal lesions in vivo.
abstract: BACKGROUND
  The extent of surgical resection for malignant laryngeal lesions influences voice quality. An instrument to estimate histopathologic grading of dysplasia in vivo may spare normal tissue without increasing the risk of local failure.
  
  
  METHODS
  Laryngeal lesions (N = 39; 21 after administration of delta-aminolevulinic acid (ALA)) were investigated with laser-induced fluorescence, and the results correlated to histopathologic grading in 4 groups: non/mild dysplasia (I), moderate dysplasia (II), severe dysplasia/cancer in situ (III), and carcinoma.
  
  
  RESULTS
  At 337-nm excitation, there were differences in the fluorescence ratio I(431)/I(390) between groups I/III and carcinoma. Following 405-nm excitation, I(500 nm) group I differed significantly from group III and cancer. The sensitivity for the fluorescence method was 89%, and the specificity was 100%.
  
  
  CONCLUSIONS
  There are differences in the in vivo tissue fluorescence between tissue with different gradings of dysplasia and carcinoma.
authors.affiliation: Department of Oto-Rhino-Laryngology, Lund University Hospital, S-221 85 Lund, Sweden. roland.rydell@med.lu.se
authors.forename: Roland
authors.initials: R
authors.lastname: Rydell
authors.forename: Charlotta
authors.initials: C
authors.lastname: Eker
authors.forename: Stefan
authors.initials: S
authors.lastname: Andersson-Engels
authors.forename: Annelise
authors.initials: A
authors.lastname: Krogdahl
authors.forename: Peter
authors.initials: P
authors.lastname: Wahlberg
authors.forename: Katarina
authors.initials: K
authors.lastname: Svanberg
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000622:Aminolevulinic Acid; D001706:Biopsy; D002277:Carcinoma / Q000473:pathology*; D005260:Female; D006801:Humans; D007822:Laryngeal Neoplasms / Q000473:pathology*; D007828:Laryngoscopy; D007830:Larynx / Q000473:pathology*; D007834:Lasers; D008297:Male; D008875:Middle Aged; D017319:Photosensitizing Agents; D011230:Precancerous Conditions / Q000473:pathology; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D017319:Photosensitizing Agents; D000622:Aminolevulinic Acid