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Ileal pouch anal anastomosis (IPAA) is the treatment of choice for chronic, medically refractory mucosal ulcerative colitis, indeterminate colitis, familial adenomatous polyposis (FAP), and a select group of patients with Crohn's disease.We report outcomes, complications, and quality of life (QOL) in a cohort of 3707 patients treated at our institution from January 1984 to March 2010.Data were collected from a prospectively maintained database and chart review of 3707 consecutive primary IPAA cases. Patient demographics, postoperative complications, functional outcomes, and QOL data were available. Follow-up consisted of clinical examination with assessment of pouch function and QOL.A total of 3707 patients underwent primary pouch and 328 underwent redo pouch surgery. Postoperative histopathological diagnoses were mucosal ulcerative colitis (n = 2953, 79.7%), indeterminate colitis (n = 63, 1.7%), FAP (n = 223, 6%), Crohn's disease (n = 150, 4%), cancer/dysplasia (n = 97, 2.6%), and others (n = 221, 6.0%). Early perioperative complications were encountered in 33.5% of patients with a mortality rate of 0.1%. Excluding pouchitis, late complications were experienced by 29.1% of patients. Of those patients who had IPAA at our institution, pouch failure occurred in 197 patients (5.3%). During a median follow-up of 84 months, 119 patients (3.2%) required excision of the pouch, 32 (0.8%) had a nonfunctioning pouch, and 46 patients (1.2%) had redo IPAA. Functional outcomes and QOL were good or excellent in 95% of patients and similar in each histopathological subgroup.IPAA is an excellent option for patients with MUC, IC, FAP, and select patients with Crohn's disease.