a spasm of the cardiac sphincter (between the esophagus and the stomach); if the cardiac sphincter does not relax during swallowing the passage of food into the stomach is obstructed
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1. アカラシアの臨床症状および診断 clinical manifestations and diagnosis of achalasia
2. アカラシアの治療の概要 overview of the treatment of achalasia
3. アカラシアの病態生理および病因 pathophysiology and etiology of achalasia