Esophageal Achalasia

**Definition:** A motility disorder of the ESOPHAGUS in which the LOWER ESOPHAGEAL SPHINCTER (near the CARDIA) fails to relax resulting in functional obstruction of the esophagus, and DYSPHAGIA. Achalasia is characterized by a grossly contorted and dilated esophagus (megaesophagus).

**Tree numbers:** - C06.405.117.119.500.432

**Synonyms:** - Achalasia - Achalasia, Esophageal - Cardiospasm