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Introduction: Enteric duplication cysts found throughout the alimentary tract are rare congenital mass lesions, which usually share a common wall with the gastrointestinal tract. However, many cases of isolated enteric duplication (IED) cysts, reported in the literature, are without any attachment to the gastrointestinal tract. We report a case of an IED cyst located in the transverse mesocolon, which was successful treatment with laparoscopy, in Children’s Hospital #1, Ho Chi Minh City, Vietnam. Case presentation: A girl turned 3 years old presented with dull abdominal pain and vomiting. Abdominopelvic computed tomography revealed a lesion located around duodenojejunal flexure with a thick wall. Laparoscopy detected a mobile cystic mass found on the mesentery of the transverse colon, which was not connection or attachment to any part of the adjacent intestine. Histopathology of the cyst wall was compatible with an EDC. Conclusion: The IED cyst is an unusual phenomenon that confuse with other diagnosis in clinical. The definitive diagnosis of IED is based on histopathology. Laparoscopic resection of the cyst is the preferred treatment.