Fig. 1

The clinical course of abdominal symptoms, treatment interventions, gastroscopy findings, and pathological findings of biopsy tissue. The upper photographs show the gastrointestinal endoscopic findings of duodenal ulcer, and the lower photographs show the pathological findings of the biopsied mucosa (hematoxylin and eosin stain [H&E] × 400), along with the number of infiltrated eosinophils (cells/high-power field [HPF]). White arrows indicate duodenal ulcers. Black arrows indicate eosinophils in the mucosa