Pathological findings of the endoscopic biopsy specimens before and after treatment. A: Before treatment. Microphotograph showed inflammatory cells and crypt destruction and congestion, consistent with ischemic damage (hematoxylin-eosin staining; × 10). Lymphoma cells, granuloma formation, and vasculitis were not observed. B: After treatment. Microphotograph showed fibrosis, suggestive of scarring resulting from the previous ulceration (hematoxylin-eosin staining; × 10).