We reported a case of patient born in 1967 who has been operated on in 1987 on three years after the beginning of ulcerative colitis which became severe and resistant to the medical treatment. A total colectomy with an ileo-rectal anastomosis had been performed. The pathological diagnosis carried of the specimen was Ulcerative colitis Then a proctectomy, followed by ileo-anal anastomosis, was performed in 1993. After several episodes of pochitis and the appearance of intestinal lesions upstream the ileal pocket, the retained diagnosis was Crohn's colitis. Eight years after the ileo-anal anastomosis, the patient developed an adenocarcinoma in the ileal pocket. He has been operated on in 2002 and he had abdominoperineal resection, radiotherapy and chemotherapy. Re died in January 2003. The death was related to the recurrence of malignancy. Endoscopic controls with biopsies are mandatory doing to follow up dysplasia predictive of degeneration.
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