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Related auxiliary examinations were conducted in order to make a definitive diagnosis. Gastroscopy revealed a scar (arrow) left on the anterior wall of the duodenum from a healed ulcer (A). Double balloon enteroscopy revealed a round ulcer (arrow) characterized by hyperemia and erosion (B). Biopsy specimens from the jejunum revealed chronic inflammatory infiltrate consisting of a mixture of neutrophils, lymphocytes and plasma cells (C).
