[On a case of a rare form of dysphagia. (Lower esophageal ring)].
D003679:Deglutition; D003680:Deglutition Disorders / Q000209:etiology*; D004194:Disease; D004935:Esophageal Diseases; D004947:Esophagus; D006801:Humans
DEGLUTITION DISORDERS/etiology; ESOPHAGUS/diseases