Teenager with dysphagia

Upper GI of eosinophilic esophagitis
AP image from an upper GI exam (left) shows diffuse tapering of the distal mid-esophagus which resolves in the distal esophagus. Lateral image (right) shows the esophageal narrowing is associated with multiple ring-like narrowings encircling the esophagus.

The diagnosis was eosinophilic esophagitis.