A 26-year-old woman had been performed dilatation and curettage for a missed abortion at local clinic in 2006 and referred to our clinic for CIN 1. Cervical evaluation and trans-vaginal sonography were performed and revealed a suspicious pseudoaneurysm in the uterus. Therefore, abdominal computed tomography with angiography was performed and revealed a pseudoaneurysm in the uterus. After selective uterine arterial embolization, the pseudoaneurysm was decreased and subsided. She visited our clinic for amenorrhea and was revealed a normal intrauterine pregnancy on August 23, 2008. The prenatal care was performed uneventfully, but large placental lake was found at the 31st gestational age and enlarged to the maximal diameter of 7.6 cm with a turbulent blood flow within the lake. The patient was diagnosed as severe form of preeclampsia at 36 week 5 day of gestational age and delivered of female 2,480 gm weighted baby through emergency cesarean section. Placental lakes were observed in only 2.2% and not considered a common sonographic finding in pregnant women without other pathology. In a total of 34 cases of placental lakes, Jauniaux et al showed the presence of lakes was associated with fetal growth restriction,
gestational diabetes, maternal hypertension, preterm delivery, and macrosomic fetus.
However, the evidences for adverse effects in pregnancy outcome of large placental lakes are not clear. More clinical studies for large placental lakes seem to be needed for the evaluation the association with pregnancy outcomes.