[Ovarian hyperstimulation syndrome in preterm infants].

Ovarian cysts are a relatively frequent finding in fetuses and neonates. In preterm infants, a simultaneous occurrence of estradiol-producing ovarian cysts and edematous swelling of the vulva, the thighs and the lower abdominal wall was described by Sedin and co-workers in 1985 for the first time. This ovarian hyperstimulation syndrome occurred at a postconceptional age that slightly preceded the expected time of delivery.