P692 Clinical, therapeutic and evolutionary profile of fistulizing ano-perineal lesions in Crohn's disease

Hassine, H.(1);KAHLAOUI, F.(1);Mtir, M.(1);Cherif, D.(1);Tlili, R.(1);Kchir, H.(1);Maamouri, N.(1);

(1)Rabta Hospital, Gastroenterology, Tunis, Tunisia;


Ano-perineal lesions (APLs) during Crohn's disease (CD) are frequent and varied. Ano-perineal fistulas (APF) are the most common and severe manifestations. They are associated with increased morbidity and considerable impairment of quality of life. Their management is not always easy despite therapeutic advances, particularly anti-TNFα.The aim of our work was to describe the epidemiological profile, the therapeutic modalities and the evolutionary aspects of APF during CD.


This was a retrospective, descriptive, single-center study collecting records of patients followed for CD with APF between January 2010 and December 2020. The patients had a proctological examination and a perineal MRI. We recorded clinical, endoscopic, radiological data, therapeutic management and clinical response to the initial therapeutic regimen.  Complete remission was defined as closure of all initially productive fistulas, partial response was defined as closure of more than 50% of fistulas. Therapeutic failure was defined as closure of less than 50% of the initially productive fistulas.


83 patients followed up for CD with APLs were collated of which 38 had APF (45.7%). The mean age was 42 years [26 - 73] with a sex ratio of 0.4. Active smoking was noted in six patients (15.8%). In 55.3% of cases, PAF was present at the time of diagnosis of CD (n=21).17 patients had developed one or more PAFs during the course of their disease with a mean delay of seven years [1 - 29]. APFs were associated with luminal involvement in 94.7% of cases, with ileal location in 10 patients (26.3%), colonic location in 13 patients (34.2%) and ileocolic location in 13 patients. The APFs were perianal in 34cases, vulvovaginal in five cases and gluteal in one case. There were complex fistulas in 92.1% of cases. The number of external orifices at the time of diagnosis was respectively: 1 orifice in 63.2% of cases, 2orifices in 26.3% of cases and more than two orifices in 10.5% of cases. A perineal abscess was associated in 44.7% of cases and anorectal stricture was observed in 7.9% of patients. Seton drainage was performed in 86.6% of patients. All patients with complex APF had received anti-TNFα after disappearance of collections if initially present (infliximab (92.1%), adalimumab (7.9%)) combined with thiopurines in 97.4% of cases. After a mean follow-up of 40 months, a complete remission was observed in 14 patients (36.8%), a partial response was noted in 13 patients (34.2%). 11 patients (28.9%) were in therapeutic failure.


In our study, APFs during CD account for almost half of all APLs.Thus, the development of local therapeutic means proves to be of necessity in order to increase the efficacy of biotherapies and to accelerate the healing of APFs.