Fetal ovarian cysts are usually unilateral, diagnosed in the third trimester and are uncommon. 2. Average ovarian cyst size is 5 x 5 cm at diagnosis and size does not change throughout the pregnancy. 3. Most cysts are functional in origin and histologically benign, simple cysts. 4. Polyhydramnios is a common finding but associated anomalies are rare. 5. Although large cysts can compress other viscera and torsion or rupture can occur, in utero aspiration has limited value in prenatal management. 6. Vaginal delivery with confirmed fetal pulmonary maturity or at term is appropriate. 7. Soft tissue dystocia is rare. Cesarean delivery should be reserved for obstetrical indications only. 8. The best predictor of neonatal cyst torsion risk is length of the cyst pedicle rather than cyst size. 9. When surgery is indicated a cystectomy, with preservation of maximal ovarian tissue is to be preferred over oophorectomy. 10. Ultrasound-guided aspiration of neonatal ovarian cysts may be an alternative to surgical management.
