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박경찬 ( Park Gyeong Chan ),권중구 ( Kwon Jung Gu ),유길종 ( Yu Gil Jong ),배종석 ( Bae Jong Seog ),신재욱 ( Sin Jae Ug ),원태경 ( Won Tae Gyeong ),조규현 ( Jo Gyu Hyeon ),허성욱 ( Heo Seong Ug ),김은영 ( Kim Eun Yeong ),이창형 ( 대한소화기학회 2003 대한소화기학회지 Vol.42 No.6
There are diverse ring-like narrowings in the lower esophagus: mucosal ring, muscular ring, ring-like annular peptic stricture. Esophageal muscular ring is extremely rare and generally asymptomatic. It occurs at the proximal border of the esophageal vestibule that corresponds to the upper end of the lower esophageal sphincter. We experienced a case of lower esophageal muscular ring with a symptom of intermittent mild dysphagia for 40 years and report the findings with a review of the literature.(Korean J Gastroenterol 2003;42:539-543)