title: Interobserver variation in the reporting of the histopathological grading of anal intraepithelial neoplasia.
abstract: OBJECTIVE
  To assess the consistency in the histological reporting of anal intraepithelial neoplasia (AIN) among experienced histopathologists.
  
  
  METHODS
  One hundred anal biopsy specimens were retrieved from archival material at St Mark's Hospital, London and graded by five histopathologists according to criteria outlined by Fenger (six point scale, ranging from normal to invasive carcinoma).
  
  
  RESULTS
  There was only moderate agreement among the pathologists, with unweighted k scores ranging from 0.09 to 0.48, and weighted k scores of 0.17 to 0.60.
  
  
  CONCLUSIONS
  There is considerable interobserver variation in the reporting of AIN. A simplified system of grading may help to abolish this.
authors: Colorectal Cancer Unit, St Mark's Hospital, London.
authors: P S
authors: PS
authors: Carter
authors: J P
authors: JP
authors: Sheffield
authors: N
authors: N
authors: Shepherd
authors: D H
authors: DH
authors: Melcher
authors: D
authors: D
authors: Jenkins
authors: P
authors: P
authors: Ewings
authors: I
authors: I
authors: Talbot
authors: J M
authors: JM
authors: Northover
mesh_terms: D001005:Anus Neoplasms / Q000473:pathology*; D002278:Carcinoma in Situ / Q000473:pathology*; D006801:Humans; D015588:Observer Variation