A 60-year-old man presents with progressive dysphagia to solids and liquids, regurgitation, and chest pain. Barium swallow shows “bird beak” narrowing at the lower esophageal sphincter. What is the most likely diagnosis?
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| Name | Physician Assistant National Certifying Examination |
| Code | PANCE |
| Vendor | Medical Professional |
| Certification | National Commission on Certification of Physician Assistants (NCCPA) |