The esophageal mucosal ring, otherwise known as Schatzki’ ring or B ring is a thin, diaphragm like, circumferential mucosal fold that protrudes into the lumen of the gastroesophageal junction. Symptomatic esophageal mucosal ring is found in only 0.5% of patients who undergo an esophagogram. In Korea, symptomatic esophageal mucosal ring of adult is very rare. A 66-
year-old man was admitted to the hospital with progressive dysphagia of five months' standing. The endoscopy revealed a mucosal ring with a narrowed esophageal lumen of about 4mm. Herein, we report a case of endoscopic balloon dilatation using controlled radial expansion (CRE) balloon under fluoroscopic control.

• 김석원(조선대학교 의학전문대학원 내과학 교실) | Seok Won Kim
• 이준(조선대학교 의학전문대학원 내과학 교실) | Jun Lee Corresponding author
• 김형호(조선대학교 의학전문대학원 내과학 교실) | Hyung Ho Kim
• 김영대(조선대학교 의학전문대학원 내과학 교실) | Young Dae Kim
• 박찬국(조선대학교 의학전문대학원 내과학 교실) | Chan Guk Park
• 김만우(조선대학교 의학전문대학원 내과학 교실) | Man Woo Kim