Prenatal diagnosis of an intrathoracic gastric duplication: a case report.

We report an intrathoracic gastric duplication cyst detected antenatally on obstetrical ultrasonography at 33 weeks of gestation. After birth, the newborn was directly intubated. At day 19, the intrathoracic cyst was removed, and the patient discharged on his 27th day of life. Histologic findings confirmed the diagnosis of a gastric duplication cyst. This appears to be the first reported case of an intrathoracic gastric duplication detected antenatally. Intrathoracic gastric duplication should be among the differential diagnosis of any mediastinal cyst discovered antenatally; its detection allows appropriate management at birth.