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Esophageal biopsies (H&E, ×40) showing a intraepithelial eosinophilic infiltration (> 20/hpf), b prominent subepithelial fibrosis and scattered eosinophilic infiltration (×10), c lamina propria with eosinophilic infiltration (×40), and d mixed inflammation in the subepithelial tissue (×20)
