[Ovarian pseudocysts in female newborn infants: prenatal ultrasonic diagnosis and surgical consequences].

During the last year we diagnosed within the scope of preventive medical care of pregnant women in about the 30th pregnancy week, seven foetuses with abdominal cystic tumours by ultrasound examination. Postpartal ultrasound controls of the mature newborn confirmed the findings. After laparotomy we found ovarian pseudocysts with a volume up to 90 ccm. Histologically we could not identify ovarian tissue. In 66% of the cases we found small cysts on the contralateral ovary. Differential diagnosis and the possible complications must be considered. A laparotomy should be performed and only by high steroid serum level a conservative therapy with MPA should be considered. This is the case in premature newborn with an immature endocrine regulation mechanism.