ABSTRACT
Ovarian cysts are the most frequent, prenatally diagnosed intra-abdominal cysts. Prenatal ultrasonography allows diagnosis of ovarian cysts and may suggest antenatal complications. The management of fetal ovarian cysts is still controversial despite the improvement in prenatal diagnosis with ultrasonography. Some studies suggest an aggressive management, while others plead for a conservative one. We report on the first successfully treated large neonatal ovarian cyst from Iran. She was a normal-term infant with respiratory distress due to the large size of the ovarian cyst diagnosed prenatally. We didn't find any other related anomaly in the neonate. Neonatal simple ovarian cysts are rare, but may cause complications. Most small simple cysts regress spontaneously; surgical intervention is reserved for complicated or large size ovarian cysts