Congenital diaphragmatic eventration is the abnormal elevation of the diaphragm into the thoracic cavity. Sometimes, it is not easy to differentiate congenital diaphragmatic eventration from diaphragmatic hernia by either prenatal sonography or postnatal chest radiography. However, differential diagnosis of both diseases is practical because of different prognosis and surgical approaches. Careful interpretation of postnatal serial chest X-rays is mandatory to differentiate between both diseases. We report two neonates with congenital diaphragmatic eventration of left diaphragm that initially misdiagnosed as diaphragmatic hernia by prenatal sonography and postnatal chest radiography.