A 25-year-old patient presents to your office for surveillance of familial adenomatous polyposis. He has a history of proctocolectomy with ileal pouch–anal anastomosis. Esophagogastroduodenoscopy reveals 8 duodenal polyps that range from 6 to 8 mm. Pathology reveals tubulovillous histology with moderate dysplasia. How often should endoscopic surveillance be performed?

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