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Background:The long-term management of perianal Crohn's disease for patients on anti-TNF-α therapy remains challenging. Aim: To evaluate the long-term course and complications of patients with perianal fistulas treated with anti-TNF-α based on their clinical remission and healing on MRI. Methods: Patients were evaluated clinically and by MRI. Deep remission was defined as clinical remission associated with the absence of contrast enhancement and T2 hyperintensity on MRI. Flare-free survival, surgery and hospitalizations were compared based on the presence or not of deep remission. Results: Forty-eight consecutive patients were included with a median follow-up of 62 months after anti-TNF-α first administration. Deep remission was observed in 16 patients (33.4 %). For patients in deep remission, the median time to any perianal event was 116 months (95-130) versus 42 months (8-72) in patients with pathological MRI (p < 0.001). Sixteen patients (50%) with pathological MRI had perianal surgery versus 2 (12.5%) in the deep remission group (p < 0.05). The mean duration of cumulative hospital stays was 0.75±0.52 days in the deep remission group versus 19.7±7.4 in the pathological group (p < 0.05).Conclusions: Higher flare-free survival and lower rates of surgery and hospitalization were found in patients achieving deep remission.

The general quality of the studies focusing on the treatment of SRUS was poor due to the heterogeneity of the population, the sample size of the cohorts, and the heterogeneity of efficacy assessments. The therapeutic approach appears to be multimodal and multidisciplinary and validated in centres of expertise. Further studies evaluating multimodal strategies are needed.