title: Lower esophageal sphincter dysfunction in achalasia.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000388:Air; D002648:Child; D004106:Dilatation; D004931:Esophageal Achalasia / Q000503:physiopathology* / Q000628:therapy; D004943:Esophagogastric Junction / Q000502:physiology / Q000503:physiopathology*; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D008297:Male; D008365:Manometry; D008722:Methods; D008875:Middle Aged; D011312:Pressure; D014159:Transducers