Type : Phenotype or locus, molecular basis unknown;
Description : Achalasia is a primary motor disorder of the esophagus. It is characterized by aperistalsis
and a failure of the lower esophageal sphincter to relax due to a loss of inhibitory
nitrinergic neurons in the esophageal myenteric plexus. Patients typically present
with dysphagia, regurgitation, retrosternal pain, and substantial weight loss (Farrokhi
and Vaezi, 2007; summary by Gockel et al., 2010).;