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Patients with dysphagia will get an upper endoscopy to rule out other conditions such as esophageal cancer, achalasia and strictures. However, patients with eosinophilic esophagitis have specific endoscopic characteristics like narrowing of the esophagus, concentric rings and longitudinal furrows, as shown in this image.
In some cases, the endoscopic evaluation shows normal esophageal mucosa and diagnosis is made by biopsies that show the large amount of eosinophils in the lining of the esophagus, as shown below.