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A 13-year-old female patient with a mass in the right upper quadrant of the abdomen for 2 months were admitted to the Southwest Hospital on February 1,2009.She was first misdiagnosed as with congenital choledochal cyst,while further examination revealed that there was no relationship between the cyst and bile duct,so exploratory laparotomy was carried out.The cyst was located at the mesentery,and was confirmed as abdominal cyst developed from the oesophagus and ectopic gastric mucosa.