Development and multi-observer validation of a histopathological scoring system for interstitial cystitis/bladder pain syndrome diagnosis - Summary - MDSpire

Creation and validation by multiple observers of a histopathological scoring system for diagnosing interstitial cystitis/bladder pain syndrome

  • By

  • Yoshiyuki Akiyama

  • Sachin Malde

  • Kostika Lako

  • Mai Iwaya

  • Takeshi Uehara

  • Aya Niimi

  • Masafumi Horie

  • Tetsuo Ushiku

  • Akiteru Goto

  • Haruki Kume

  • Yukio Homma

  • Mauro Cervigni

  • Daichi Maeda

  • July 17, 2026

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Objective:

To develop a histopathological scoring system for classifying bladder biopsies into BPS, HIC, and inflammatory non-HIC cystitis, and to validate its diagnostic performance and inter-observer reproducibility.

Approach:
  • Study Design: The study involved a cohort of patients diagnosed with BPS, HIC, and other cystitis types, with biopsies evaluated by multiple pathologists using a blinded approach.
  • Histopathological Scoring System: A five-feature scoring system was developed, assessing inflammation, plasma cell infiltration, eosinophil infiltration, tertiary lymphoid structures, and urothelial denudation.
Key Findings:
  • The histopathological scoring system demonstrated improved diagnostic consistency for distinguishing HIC from non-HIC cystitis.
  • Inter-observer reproducibility was validated among pathologists from different countries.
Interpretation:

The study supports the utility of a structured histopathological scoring system in enhancing the diagnostic accuracy for IC/BPS.

Limitations:
  • The study's findings may be limited by the specific patient population and the histological features evaluated.
Conclusion:

The developed scoring system may aid in the accurate classification of IC/BPS, potentially improving diagnostic practices.

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