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Ringed esophagus sign on barium esophagogastroduodenoscopy.

A 35 year-old male patient with history of atopy was referred to the general surgery consultation with non-specific esophageal discomfort and occasional food impaction, especially with meat. Symptoms were discontinuous and had started approximately two years earlier. A barium esophagogastroduodenoscopy (EGD) was ordered on suspicion of achalasia (Fig. 1). What is the most likely diagnosis according to the imaging findings?