You are consulted on a 43-year-old woman with Crohn’s disease, who underwent a balloon dilation procedure for an ileocolic stricture 4 months ago. She is now admitted to the hospital with complaints of right lower quadrant pain that radiates through her right lower extremity, diarrhea, and abdominal distention. Her white blood cell count is 15,000/µL (1510⁹/L), and examination reveals right lower quadrant tenderness without peritonitis. She is currently receiving prednisone and biologic therapy for her Crohn’s disease. Imaging is shown (Figure). In addition to intravenous antibiotics, what is the most appropriate next step in management?