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Perianal Crohn's Disease - IBD Algorithm • 5-40% w perianal fistula • ↑ risk if colonic CD • Initial manifestation in 10% • refractory to medical therapy • Chronic fistula has carcinoma risk Dr. Wade Billings @wabillin #Perianal #Crohns #Disease #IBDAlgorithm #IBD #Algorithm #gastroenterology #management #treatment