Roentgenographic diagnosis of primary disorders of esophageal motility.
D003680:Deglutition Disorders / Q000000981:diagnostic imaging*; D004931:Esophageal Achalasia / Q000000981:diagnostic imaging; D004935:Esophageal Diseases / Q000000981:diagnostic imaging*; D004947:Esophagus / Q000033:anatomy & histology / Q000502:physiology; D005769:Gastrointestinal Motility; D006801:Humans; D009119:Muscle Contraction; D011859:Radiography; D013035:Spasm / Q000000981:diagnostic imaging