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Poster abstractsDoppler we demonstrated flow in the dilation and with pulsed Doppler we found that the flow was arterial. With these findings our diagnosis was aneurysm of the umbilical artery. The rest of the fetal exploration and measurements were normal. The diameter of the aneurysm increased throughout the pregnancy. In view of fetal risk, delivery was performed at 34 weeks. The post-delivery examination of the umbilical cord confirmed the diagnosis. After six months, the baby is doing well. Discussion: The aneurysm was seen early at 19 weeks and coexisted with other alterations of the umbilical cord. The diameter increased with gestational age. In a previously reported case, there was intrauterine fetal death at 36 gestational weeks and it was speculated that the stretching and compressing of an uninvolved vein over the expanding aneurysm was the cause of the fetal asphyxia. For this reason and because of the increased diameter of the aneurysm we decided to deliver the baby at 34 weeks. Conclusion: If umbilical cord aneurysm is diagnosed, we must consider pre-term delivery of the fetus to prevent fetal damage and/or death. P33.12Intraabdominal varix of the umbilical vein: Three case reports M. Horenstein, M. S. Horenstein, A. Perez Arra Diagnostico Gineco Obstetrico, Mendoza, ArgentinaIntroduction: Fetal intra-abdominal umbilical vein (FIUV) varix is a rare entity of unknown etiology. It may be associated with other structural and chromosomal abnormalities. Fetal outcome ranges from normal delivery with no complications, to hemolytic anemia with hydrops, preterm delivery, and fetal demise. Therefore, some have advocated early delivery at 34 weeks' gestation. We describe three ultrasound diagnoses of this condition. Objective: To describe our experience with this rare entity. Methods:We reviewed all cases of fetal intrauterine vein (FIUV) varices diagnosed in our practice from 2006 to 2007. The FIUV diameter was considered to be dilated at 2 SD above the normal for gestational age (GA). These fetuses were studied with 2D, 3D, color Doppler and power-angio echocardiography using a GE Voluson 730 PRO. Results: Our local incidence of FIUV varix in uncomplicated third trimester pregnancies was 3.74 cases per 10,000. All were single, female, AGA fetuses with no additional sonographic abnormalities. No intra-or extra-uterine deaths occurred. Case A was diagnosed at 33wk 4d to a 33 year-old G1P0. Baby was born vaginally at 39wk weighing 3,465 g. Case B was diagnosed at 38wk 5d to a 33 year-old G2P0. Baby was born via repeat cesarean section at 37wk weighing 2,770 g. Case C was diagnosed at 29wk 1d and is yet to be born. Conclusions: We hypothesize that when FIUV varix is diagnosed during the third trimester in uncomplicated pregnancies no early delivery may need to be offered. P33.13 Prenatal diagnosis of renal duplication by fetal sonography Baskent University School of Medicine Department of Obstetrics and Gynecology, Ankara, TurkeyDuplication of the renal collecting system is a common abnormality that affects fe...