Serrated polyps of the colon: How reproducible is their classification?

Arzu Ensari, Banu Bilezikçi, Fatima Carneiro, Gülen Bülbül Doǧusoy, Ann Driessen, Ayşe Dursun, Jean François Flejou, Karel Geboes, Gert De Hertogh, Anne Jouret-Mourin, Cord Langner, Iris D. Nagtegaal, Johan Offerhaus, Janina Orlowska, Ari Ristimäki, Julian Sanz-Ortega, Berna Savaş, Maria Sotiropoulou, Vincenzo Villanacci, Nazmiye KurşunFred Bosman

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


For several years, the lack of consensus on definition, nomenclature, natural history, and biology of serrated polyps (SPs) of the colon has created considerable confusion among pathologists. According to the latest WHO classification, the family of SPs comprises hyperplastic polyps (HPs), sessile serrated adenomas/polyps (SSA/Ps), and traditional serrated adenomas (TSAs). The term SSA/P with dysplasia has replaced the category of mixed hyperplastic/ adenomatous polyps (MPs). The present study aimed to evaluate the reproducibility of the diagnosis of SPs based on currently available diagnostic criteria and interactive consensus development. In an initial round, H&E slides of 70 cases of SPs were circulated among participating pathologists across Europe. This round was followed by a consensus discussion on diagnostic criteria. A second round was performed on the same 70 cases using the revised criteria and definitions according to the recent WHO classification. Data were evaluated for inter-observer agreement using Kappa statistics. In the initial round, for the total of 70 cases, a fair overall kappa value of 0.318 was reached, while in the second round overall kappa value improved to moderate (kappa=0.557; p

Original languageEnglish (US)
Pages (from-to)495-504
Number of pages10
JournalVirchows Archiv
Issue number5
StatePublished - Nov 2012
Externally publishedYes


  • Criteria
  • Diagnosis
  • Kappa statistics
  • Serrated polyp

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Cell Biology
  • Molecular Biology


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