esophageal achalasia

esophageal achalasia
failure of the lower esophageal sphincter to relax with swallowing due to degeneration of ganglion cells in the wall of the organ. The thoracic esophagus also loses its normal peristaltic activity and becomes dilated (megaesophagus).

Barium meal demonstrating esophageal achalasia in a 9-year-old patient. (A), The enlarged esophagus shows very slow emptying and a typical “carrot” or “bird beak” appearance; (B) some feeble esophageal contractions are seen but the esophageal walls remain widely separated and so peristalsis is absent.


Medical dictionary. 2011.

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