Atrophy of inhibitory neurons in the Auerbach plexus → lack of inhibitory neurotransmitters (e.g., NO, VIP) → inability to relax and increased resting pressure of the LES, as well as dysfunctional peristalsis → esophageal dilation proximal to LES
Clinical features
Diagnostics
Esophageal barium swallow: supportive and/or confirmatory test
Bird-beak sign: dilation of the proximal esophagus with stenosis of the gastroesophageal junction
