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Interobserver variability in application of the revised Sydney classification for gastritis
J Guarner1, R Herrera-Goepfert, A Mohar
1Infectious Disease Pathology Activity, DVRD, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
Human Pathology
|February 10, 2000
Summary
The Sydney classification for gastritis shows low pathologist agreement, especially for atrophy. Improved concordance was seen after joint review, but perfect agreement remains unlikely due to subjective interpretation.
Area of Science:
- Gastroenterology
- Pathology
- Histology
Background:
- The Sydney classification is a standard for grading gastric biopsies.
- Gastric preneoplastic lesions require accurate histological assessment.
- Pathologist interpretation can influence diagnostic concordance.
Purpose of the Study:
- To assess inter-pathologist diagnostic concordance using the Sydney classification for gastric biopsies.
- To evaluate the impact of joint review on improving agreement rates.
- To determine if general surgical pathologists achieve similar concordance to gastrointestinal pathologists.
Main Methods:
- Two general surgical pathologists independently reviewed 150 gastric biopsies.
- Kappa statistics were used to assess diagnostic concordance for key histological features.
- Disagreed cases were jointly reviewed to reach a consensus diagnosis.
- Concordance was reassessed after initial independent review and after joint review.
Main Results:
- Initial low concordance rates were observed for Heliobacter pylori (0.59), acute inflammation (0.22), intestinal metaplasia (0.60), and atrophy (0.04).
- Concordance improved in the second review group (H. pylori 0.77, acute inflammation 0.50, intestinal metaplasia 0.70, atrophy 0.64).
- Joint review led to better agreement, though ideal kappas (>0.80) were not consistently achieved.
Conclusions:
- The Sydney classification, while a guideline, exhibits significant inter-pathologist variability.
- Subjective interpretation inherent in the classification limits complete diagnostic agreement.
- Concordance among general surgical pathologists, even after joint review, highlights challenges in standardized histological grading of gastric biopsies.