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Symptomatic anal disease (excluding skin tags) was observed in 49 out of 151 successive patients treated for Crohn's disease. Two main types of anal disease were encountered: anal ulceration (23 patients) and anal abscesses and fistulae (26 patients). The ulcer group rarely required local surgical treatment. In the fistula group, a low tract was demonstrated and laid open in 20 patients. The healing times after operation in these patients were compared with those of 18 patients with non-Crohn's fistula-in-ano treated by the same method. No significant difference between the two groups could be demonstrated. Surgical treatment of low fistula-in-ano may be undertaken in patients with Crohn's disease, provided the bowel disease is under adequate control.