Background: Duplication cysts originated from gastrointestinal system (GIS) are rare anomalies (1/4500) and these cysts are most commonly encountered from ileum. In this case report, differentiation of cystic lesions located at posterior mediastinum and evaluation of duplication cyst in the view of literature is aimed.
Case: A pregnant women at 28 week of gestation was referred to our clinic as fetus presenting with a cystic lesion located at posterior mediastinum which was suspected as diaphragmatic hernia. In the evaluation of fetal thorax, normal diaphragm and a smooth cystic structure located in the front of the descending aorta and in the right side of posterior mediastinum were seen in which it was thought to be a duplication cyst. In addition to the above ultrasonographic features, single umbilical artery was observed. After vaginal delivery, surgical operation was performed and pathological evaluation of the cyst confirmed prenatal diagnosis of intestinal duplication cyst.
Conclusion: Cooperation of obstetrician, geneticist and thoracic surgeon during evaluation of such cases has an importance on understanding of prenatally diagnosed disorder by family and planning of postnatal operations.