This is Dr. David
you need a biopsy of the esophageal wall to check for eosinophilic esophagitis
you should get a barium swallow study as well.
large-bore endoscopic dilation or bougienage (15 mm/45 Fr or larger) is the mainstay of therapy for both upper and lower esophageal lesions or rings.
stomach acid suppression with a proton pump inhibitor like nexium or omeprazole can help.
is a good article.
let me know if you have other questions.
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