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A 45-year-old man presents to your office with complaints of bloating, constipation, and intermittent diarrhea over the last 3 months. He has a 20-year history of Crohn’s disease and is currently receiving biologic therapy. On physical examination, he is mildly distended, without peritonitis. Colonoscopy confirms a sigmoid stricture that cannot be traversed. The most appropriate treatment is:

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