What proportion of children diagnosed with indeterminate colitis were reclassified as UC or CD during follow-up

What is known

- In one pediatric cohort of 639 patients, 171 were classified as IC; only 29 (17%) were reclassified (6 as CD, 23 as UC) and 142 remained IC over a median follow-up of about 10 years. ^1,2 - In a single-center series of 250 children with IBD, 74 (29.6%) had IC; 25 of these (33.7%) were reclassified as CD or UC after a median follow-up of 1.9 years (range 0.6 - 4.5 years), 49 (66.2%) kept the IC diagnosis after a mean follow-up of 7 years, and no reclassification was seen beyond 6 years of follow-up. ² - A review reports approximately 60% of pediatric IC patients are ultimately reclassified, more often to UC. ³ - Combined ASCA/p-ANCA serology predicted UC or CD in up to 80% of patients, but only 50% of serology-positive IC patients were eventually reclassified; serology-negative patients tended to retain the IC diagnosis. ^2,4

What is unknown / caveats

- One review cites ~60% pediatric reclassification while cohorts with 10-year follow-up report only ~17% - Rates depend heavily on follow-up duration and cohort definition of IC - Some cited figures come from mixed or non-pediatric or overall IBD populations - The excerpts give divergent proportions and no single consensus rate for children.

## References

1. Geboes K, De Hertogh G. Indeterminate colitis. Inflamm Bowel Dis. 2003;9(5):324-31. PMID: 14555917.

2. Carvalho RS, Abadom V, Dilworth HP, Thompson R, Oliva-Hemker M, Cuffari C. Indeterminate colitis: a significant subgroup of pediatric IBD. Inflamm Bowel Dis. 2006;12(4):258-62. PMID: 16633047.

3. Geboes K, Colombel JF, Greenstein A, Jewell DP, Sandborn WJ, Vatn MH, Warren B, Riddell RH. Indeterminate colitis: a review of the concept--what's in a name?. Inflamm Bowel Dis. 2008;14(6):850-7. PMID: 18213696.

4. Cetinoglu S, Aksoy B, Demir I, Kahveci S, Karabag SO, Guler S, Cagan Appak Y, Baran M. Long-Term outcomes of children diagnosed with indeterminate colitis. Arab J Gastroenterol. 2026;27(1):108-112. PMID: 41592969.

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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._