A 45-year-old man with history of ulcerative colitis presents for endoscopic assessment of his J-pouch after experiencing occasional bleeding, urgency, and abdominal pain for the past 3 months. He does not smoke or use nonsteroidal anti-inflammatory drugs; he was unresponsive to antibiotics and topical mesalamine preparations. Endoscopic images of the pouch and prepouch ileum are shown (Figures 1 and 2). What is the most likely histologic finding from the biopsies?