Surveillance interval in Crohn's colitis with prior LGD

What is known

• ECCO recommends annual colonoscopy for the highest-risk group, explicitly including patients with a history of dysplasia (or PSC or stricture). ¹
• When LGD or HGD is confirmed by a second GI pathologist, guidelines frame management as ongoing surveillance versus proctocolectomy based on patient/disease factors and preference. ²
• For a DALM with clear surrounding mucosa, one guideline suggested 6-monthly follow-up as a reasonable surveillance option. ³

What is unknown / caveats

• Societal intervals differ (ECCO annual for prior dysplasia vs older schedules of 1-2 or 1-3 years)
• Unifocal vs multifocal LGD and visible vs non-visible LGD alter whether surveillance or colectomy is advised
• No single retrieved source gives one fixed interval specifically for post-LGD Crohn's colitis
• Much of the underlying dysplasia surveillance data derives from ulcerative colitis and is extrapolated
• The exact interval is individualized and society-dependent, and confirmed LGD often shifts the discussion toward colectomy rather than continued surveillance.

References

1. [No authors listed]. The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Surgical Management of Crohn's Disease. Dis Colon Rectum. 2020;63(8):1028-1052. PMID: 32692069.

2. Lightner AL, Vogler SA, Vaidya PS, McMichael JP, Jia X, Regueiro M, Steele SR. The Fate of Unifocal Versus Multifocal Low-Grade Dysplasia at the Time of Colonoscopy in Patients With IBD. Dis Colon Rectum. 2021;64(11):1364-1373. PMID: 34623348.

3. Collins PD, Mpofu C, Watson AJ, Rhodes JM. Strategies for detecting colon cancer and/or dysplasia in patients with inflammatory bowel disease. Cochrane Database Syst Rev. 2006(2):CD000279. PMID: 16625534.

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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.