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| Esophageal Achalasia Achalasia, Esophageal | Cardiospasm | Megaesophagus | Achalasias, Esophageal | Cardiospasms | Esophageal Achalasias Disorder of lower esophagogastric motility due to failure of the lower esophageal sphincter to relax with swallowing. It is sometimes caused by degeneration of the ganglion cells of the myenteric plexus or of the vagal motor nuclei. |