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Open Access Research

Interobserver variation in classifying lymphomas among hematopathologists

Tawatchai Pongpruttipan1, Sanya Sukpanichnant1, Thamathorn Assanasen2, Lertlakana Bhoopat3, Kanita Kayasut4, Wasana Kanoksil5 and Pongsak Wannakrairot2*

Author Affiliations

1 Department of Pathology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, 10330, Thailand

2 Department of Pathology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand

3 Department of Pathology, Faculty of Medicine, Chiang Mai University, Bangkok, Thailand

4 Department of Pathology, Faculty of Medicine, Prince of Songkla University, Bangkok, Thailand

5 Department of Pathology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand

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Diagnostic Pathology 2014, 9:162  doi:10.1186/s13000-014-0162-3

Published: 22 August 2014

Abstract

Background

Lymphomas are common malignancies that have various subtypes with many overlapping histologic, immunophenotypic and genetic features. Therefore, discordance in classifying lymphoma among pathologists may be encountered. But this issue is not well characterized. We conducted the present study to demonstrate discordances among Thai hematopathologists as well as to highlight common arguing points for classifying lymphomas.

Methods

The 117 lymphoma cases were randomly retrieved and individually reviewed by 7 hematopathologists, members of the “Thai Hematopathologist Group,” without knowing the original diagnoses. The consensus diagnoses were given from a discussion by all members. In each case, the diagnosis from each participant was compared with the consensus diagnosis and classified into 4 categories as follow: 1) concordance, 2) minor discordance, 3) major discordance and 4) serious discordance.

Results

There were approximately 11% discordances between original and consensus diagnoses. The average discordances among all pathologists according to minor, major and serious discordances were 10%, 3.5% and 0.3%, respectively. Diffuse large B-cell lymphoma had the least discordance (7%). Small biopsies had been found to increase discordances in some lymphoma subtypes.

Conclusions

The present study reveals some degrees of interobserver variation in classifying of lymphoma by using the 2008 WHO classification among hematopathologists. Some types of lymphomas on small biopsies were found to have a significant higher discordance rate. This study also described some common diagnostic discordances regarded as potential pitfalls in classifying lymphomas.

Virtual Slides

The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/13000_2014_162 webcite

Keywords:
Discordance; Disagreement; Interobserver variation; Pitfall; Hematopathologist; Lymphoma; WHO classification