Functional disorders of the pharyngo-esophageal junction. Achalasia and chalasia.
D004931:Esophageal Achalasia / Q000000981:diagnostic imaging* / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009223:Myotonic Dystrophy / Q000150:complications / Q000000981:diagnostic imaging; D011859:Radiography