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Background and aims  The significance of different ages of perianal disease (PD) onset in patients with perianal Crohn’s disease (PCD) remains unknown. We aimed to investigate the impact of paediatric-onset PD (POP) and adult-onset PD (AOP) on the Crohn’s disease (CD) course in a Chinese cohort.    Methods  The medical records of diagnosed PCD patients from 2008 to 2018 were reviewed retrospectively. The cumulative incidence and predictors of intestinal resection were calculated using the Kaplan–Meier and logistic regression analysis.    Results  Complex perianal fistulas (71.7% vs 50.0%,  p  = 0.011) and infliximab (IFX) treatment (33.3% vs 22.0%,  p  = 0.044) were more common among the POP patients (age < 18 years old, n = 84). A younger PD onset age (15.1 ± 2.9 vs 30.2 ± 10.5 years,  p  < 0.001) and shorter PCD diagnostic delay (12 vs 24 months,  p  = 0.033) was found in the POP cohort. AOP patients (age ≥ 18 years old, n = 209) had a higher rate of current smoking (12.9% vs 4.8%,  p  = 0.040), stricturing behaviour (42.1% vs 27.4%,  p  = 0.024) and intestinal resection (21.1% vs 4.8%,  p  = 0.001). The cumulative probability of intestinal resection in AOP patients was higher than that in POP patients ( p  = 0.007). In multivariable analysis, AOP (OR: 4.939, 95% CI 1.538–15.855,  p  = 0.007), stricturing behaviour (OR: 1.810, 95% CI 1.008–3.251,  p  = 0.047) and rectal inflammation (OR: 3.166, 95% CI 1.119–8.959,  p  = 0.030) were predictive factors for CD-related intestinal resection in all PCD patients. AOP patients with complex perianal fistula (OR: 2.257, 95% CI 1.041–4.891,  p  = 0.039) and POP patients with rectal inflammation (OR: 3.166, 95% CI 1.119–8.959,  p  = 0.030) were more likely to suffer intestinal resection. The IFX administration significantly decreased the rate of intestinal resection in AOP patients ( r  = − 0.900,  p  = 0.037).    Conclusions  The AOP patients have more complicated luminal disease and higher rate of intestinal resection than COP patients. The perianal diseases onset-age can provide clinical treatment guidance for individual management of CD patients.

bmc gastroenterology

Perianal disease onset age is associated with distinct disease features and need for intestinal resection in perianal Crohn’s disease: a ten-year hospital-based observational study in China