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  • Title: Perianal Crohn's disease findings other than fistulas in a population-based cohort.
    Author: Peyrin-Biroulet L, Loftus EV, Tremaine WJ, Harmsen WS, Zinsmeister AR, Sandborn WJ.
    Journal: Inflamm Bowel Dis; 2012 Jan; 18(1):43-8. PubMed ID: 21351216.
    Abstract:
    BACKGROUND: The cumulative incidence of and risk factors for perianal Crohn's disease (CD) for findings other than fistulas are unknown. METHODS: The medical records of 310 incident cases of CD from Olmsted County, Minnesota, diagnosed between 1970 and 2004, were reviewed for evidence of perianal disease findings other than fistulas. Cumulative incidence was estimated using the Kaplan-Meier method, and associations between baseline factors and time to first event were assessed using proportional hazards regression. Four types of lesions were studied: anorectal strictures, deep anal canal ulcers, anal fissures, and perianal skin tags. RESULTS: The 10-year cumulative probability from time of diagnosis was 5.8% (95% confidence interval [CI], 2.6%-8.8%) for anorectal strictures, 6.6% (3.6%-9.6%) for deep anal canal ulcers, 10.5% (6.8%-14.1%) for anal fissures, and 18.7% (13.9%-23.3%) for perianal skin tags. The cumulative probability for any perianal lesion other than fistulas was 21.3% (16.5%-25.8%) at 5 years and 29.2% (23.5%-34.5%) at 10 years. Baseline factors associated with time to first perianal lesion other than fistulas were age (hazard ratio [HR] per 10 years, 0.9; 95% CI, 0.8-0.98; P = 0.026), female gender (HR, 1.7; 95% CI, 1.1-2.7; P = 0.013), and presence of extraintestinal manifestations (HR, 1.7; 95% CI, 1.03-2.8; P = 0.038). CONCLUSIONS: Perianal lesions other than fistulas occurred frequently during the clinical course of CD. Female gender and extraintestinal manifestations were associated with increased risks for perianal lesions other than fistulas, while older age at diagnosis was associated with a slightly decreased risk.
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