Gastrointestinal duplication cysts are actually rare congenital anomalies that can accompany various anomalies and are most frequently seen in the small intestine. Gastrointestinal duplication may accompany anomalies such as vertebral anomalies, spinal cord malformations. Depending on the location, symptoms such as chest pain, shortness of breath, cough, asthma-like symptoms, hemoptysis, cyanosis, vomiting, difficulty swallowing, weight loss, hematemesis and melena can be observed. To our knowledge, we report a rare case that has not been reported in pediatric palliative care. We present a case operated for diaphragmatic hernia in the neonatal period. A 3-month-old patient with respiratory distress who was followed up in pediatric palliative care was reoperated and pathologically diagnosed as gastrointestinal duplication cyst. Thoracic cysts can have a wide variety of etiology. The correct diagnosis can be made by performing further examinations and appropriate surgery.