Esophageal Rings, Furrows, and Plaques: What Next?

A 32-year-old man presents with dysphagia to solid foods. His symptoms have increased in frequency during the past 6 months. He has taken to eating much more slowly and needs water to help swallow food. His history is remarkable for seasonal allergies, for which nasal fluticasone is prescribed. He undergoes an upper endoscopy, which demonstrates diffuse rings, longitudinal furrows, and white plaques. Esophageal biopsies reveal dense eosinophilia throughout.