Histology

• chronic features: basal cell hyperplasia, papilla elongation, eosinophils
  • basal cell hyperplasia (> 15% of mucosa)
  • papilla elongation (> 60% of mucosa)
  • eosinophils (distal esophagus, < 8 eos per 40x field)
• acute features: edema, necrosis, inflammation
• severe features: ulcer, fibrosis