In patients with UC, does the risk of colorectal dysplasia differ between those with and without PSC
What is known
- Many studies report that colonic dysplasia and cancer develop more frequently in ulcerative colitis patients with primary sclerosing cholangitis. 1 - One study attributes the higher dysplasia/cancer frequency to longer duration of total colitis and fewer colectomies in these patients. 1 - A large cohort was designed to define the risk and risk factors for cancer or dysplasia in UC patients with primary sclerosing cholangitis; surveillance is strongly recommended. 2,3
What is unknown / caveats
- Excerpts do not provide the magnitude of the increased risk - Much of the supporting detail appears only in reference lists, not primary results - The excerpts state a higher frequency but do not quantify the difference in dysplasia risk.
## References
1. Parlak E, Ulker A, Alkim C, Ozderin Y, Dişibeyaz S, Tunç B, Dağli U. The course of colonic disease in ulcerative colitis patients with primary sclerosing cholangitis. Turk J Gastroenterol. 2002. PMID: 16378294.
2. Chaparro M, Trapero-Marugán M, Guijarro M, López C, Moreno-Otero R, Gisbert JP. Dysplasia and colorectal cancer in a patient with ulcerative colitis and primary sclerosing cholangitis: a case report and a short review of the literature. J Crohns Colitis. 2013. PMID: 22552273.
3. Shetty K, Rybicki L, Brzezinski A, Carey WD, Lashner BA. The risk for cancer or dysplasia in ulcerative colitis patients with primary sclerosing cholangitis. Am J Gastroenterol. 1999. PMID: 10364038.
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⚠ Required context not in this corpus (moderate). SCENIC consensus (Laine 2015, PMID 25708752): dysplasia surveillance in colonic IBD uses high-definition colonoscopy with chromoendoscopy and TARGETED biopsy of visible lesions, and a completely endoscopically resected visible dysplastic lesion is followed by surveillance rather than reflex colectomy.
_Why this matters:_ Advising colectomy for an endoscopically resectable visible dysplastic lesion, or describing random-biopsy-only surveillance as current practice, can commit a patient to an avoidable proctocolectomy.
_Added by the landmark interlock. This corpus is surgical in scope and cannot admit the source paper (PMID 25708752). Not generated by the RAG._
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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._
Reviewer notes