Frequency of the Asymptomatic Lower Esophageal Contractile Ring

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Abstract
WITHIN recent years several papers have identified a ringlike narrowing or constriction in the terminal portion of the esophagus as a cause of dysphagia1 2 3 (Fig. 1). Although this narrowing had been observed before these reports and described as an annular indentation in the phrenic ampulla, little clinical significance was attached to its presence.4 That the constriction is capable of producing symptoms was demonstrated by the feeding of a barium bread or barium-steak meal or barium-filled gelatin capsules to patients who did not have any obvious cause for their dysphagia but did have an annular constriction on x-ray study. After these . . .

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