Is chromoendoscopy superior to high‑definition white‑light endoscopy for detecting dysplasia in ileal pouches during surveillance

What is known

- Chromoendoscopy has been assessed in pouch surveillance in only a couple of small studies, both in FAP patients, never in UC pouches. Colonic data are extrapolated. ¹ - Against standard-definition white light, chromoendoscopy shows a 2-3 fold higher per-patient and ~7-9% incremental dysplasia yield, and some RCTs/meta-analyses favor it over HD white light. ^2–5 - One randomized/targeted-biopsy trial found HD chromoendoscopy superior to HD white light for neoplasia, but took ~7 minutes longer. ⁶ - Multiple sources report HD white-light platforms achieve similar dysplasia detection to chromoendoscopy, and a systematic review found no significant difference with ~9 min longer procedure time. ^6,7

What is unknown / caveats

- RCT/meta-analysis data favor chromoendoscopy over HD white light while systematic reviews and ASCRS/SCENIC find no significant difference in HD settings - No pouch-specific UC comparative data. All HD chromoendoscopy vs HD white-light evidence is colonic - Chromoendoscopy adds ~7-9 minutes per procedure and infrastructure/expertise barriers - Whether any colonic superiority signal translates to the ileal pouch mucosa is untested.

## References

1. Kuiper T, Vlug MS, van den Broek FJ, Tytgat KM, van Eeden S, Fockens P, Bemelman WA, Dekker E. The prevalence of dysplasia in the ileoanal pouch following restorative proctocolectomy for ulcerative colitis with associated dysplasia. Colorectal Dis. 2012;14:469-73. PMID: 21689341.

2. Shawki S, Ashburn J, Signs Steven A, Huang E. Colon Cancer: Inflammation-Associated Cancer. Surg Oncol Clin N Am. 2018;27:269-287. PMID: 29496089.

3. Sengupta, Neil, Yee, Eric, Feuerstein, Joseph D. Colorectal Cancer Screening in Inflammatory Bowel Disease. Dig Dis Sci. 2016;61:980-9. PMID: 26646250.

4. Tharian B, George N, Navaneethan U. Endoscopy in the Diagnosis and Management of Complications of Inflammatory Bowel Disease. Inflamm Bowel Dis. 2016;22:1184-97. PMID: 26717320.

5. [No authors listed]. High Risk of Colorectal Cancer After High-Grade Dysplasia in Inflammatory Bowel Disease Patients. Aliment Pharmacol Ther. 2026;63:706-714. PMID: 41132006.

6. Holubar SD, Lightner AL, Poylin V, Vogel JD, Gaertner W, Davis B, Davis KG, Mahadevan U, Shah SA, Kane SV, Steele SR, Paquette IM, Feingold DL, Prepared on behalf of the Clinical Practice Guidelines Committee of the American Society of Colon and Rectal S. The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Surgical Management of Ulcerative Colitis. Dis Colon Rectum. 2021;64:783-804. PMID: 33853087.

7. Lee GC. Surveillance and Management of Dysplasia and Malignancy in Inflammatory Bowel Disease. Surg Clin North Am. 2025;105:313-327. PMID: 40015819.

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_Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct._