Chromoendoscopy vs white light for dysplasia in Crohn's colitis

What is known

• A prospective study of 75 patients found improved dysplasia detection with chromoendoscopy (21.3%) vs high-definition endoscopy alone (9.3%, p=0.007). ¹
• A meta-analysis reported a significantly increased (~7%) per-patient yield of dysplasia detection with chromoendoscopy vs white-light endoscopy. ^1,2
• Chromoendoscopy has historically shown higher dysplasia yield than standard-definition white-light endoscopy, underpinning guideline recommendations for its use. ^3,4

What is unknown / caveats

• A large retrospective study (Mooiweer et al.) found chromoendoscopy did not increase neoplasia detection vs conventional colonoscopy with random biopsies ³
• Much of the higher-yield evidence compares chromoendoscopy against standard-definition WLE, not modern high-definition WLE ^1,3
• The ten Hove cohort addressed progression risk of detected LGD, not comparative detection rates, and pooled UC with colonic Crohn's
• Incremental benefit of chromoendoscopy over high-definition (rather than standard-definition) WLE is less certain
• Whether chromoendoscopy adds meaningful yield specifically over modern high-definition white-light endoscopy remains debated in the retrieved sources.

References

1. Stidham Ryan W, Higgins Peter DR. Colorectal Cancer in Inflammatory Bowel Disease. Clin Colon Rectal Surg. 2018;31(3):168-178. PMID: 29720903.

2. Connelly TM, Koltun WA. The surgical treatment of inflammatory bowel disease-associated dysplasia. Expert Rev Gastroenterol Hepatol. 2013;7(4):307-21; quiz 322. PMID: 23639089.

3. Ten Hove JR, Mooiweer E, van der Meulen de Jong AE, Dekker E, Ponsioen CY, Siersema PD, Oldenburg B. Clinical implications of low grade dysplasia found during inflammatory bowel disease surveillance: a retrospective study comparing chromoendoscopy and white-light endoscopy. Endoscopy. 2017;49(2):161-168. PMID: 27951611.

4. Marion JF, Waye JD, Israel Y, Present DH, Suprun M, Bodian C, Harpaz N, Chapman M, Itzkowitz S, Abreu MT, Ullman TA, McBride RB, Aisenberg J, Mayer L. Chromoendoscopy Is More Effective Than Standard Colonoscopy in Detecting Dysplasia During Long-term Surveillance of Patients With Colitis. Clin Gastroenterol Hepatol. 2016;14(5):713-9. PMID: 26656297.

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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.