6–9 October 2013, Sydney, Australia Short oral presentation abstracts after birth. Only one case was treated with surgery with an excellent evolution. The pathological examination confirmed ELS in this case. Conclusions: Although our series is small to obtain definitive conclusions, we believe that the evolution of the cases supports an expectant management. OP07.08 Case of velamental vessels in an amniotic band: a ‘‘not to touch case’’ E. Soto-Chacon, Y. Ville, M. Yamamoto Maternal Fetal Medicine, Clinica Alemana y Hospital Padre Hurtado, UDD, Vitacura, Chile Amniotic bands are typically described as sheaths of membranes in the amniotic cavity, without arteries or veins. Here we describe a rare case in which a wide plicae of membranes with a pair of artery and vein in the free border was diagnosed in the second trimester. The vessels connected a supernumerary placental lobule. The structure would have been named an amniotic band in the absence of the vessels, as divided the amniotic cavity. At 26 weeks of GA, the flow of the vein was calculated as 41ml/min and the umbilical vein flow of the fetus was measured as 197ml/min. The main concern was the rupture of the vessel, but because of the important flow and the alternative diagnosis of a velamental vessel, it was left untouched. An elective Cesarean section was performed at 37 weeks, before the onset of spontaneous labor. At birth, the prenatal findings were confirmed, and the weight of the whole placenta was 390g. The main part weighted 230g and the accessory lobule weighted 160g. The postnatal conclusion was that the supernumerary lobule was as big as the main body, and therefore, any surgery aiming to occlude it could have conducted to adverse outcome. The flow in the vessels could not represent the weights of the parts, though this was done almost 12 weeks before delivery. Supporting information can be found in the online version of this abstract OP08: FETAL GROWTH AND DOPPLER OP08.01 Comparison of centile charts: does ethnicity and methodology matter? S. T. McArthur 1 , C. M. Acton 1 , K. Kalian 1 , I. Mueller 2 , H. Karunajeewa 1 1 Radiology, Western Health, Melbourne, VIC, Australia; 2 Walter and Eliza Hall Institute, Melbourne, VIC, Australia Objectives: A validated method of deriving centile charts utilising a fetal growth equation (FGE) from birthweight data at term has been developed. Maternal ethnicity impact on birthweight is not accounted for in current population birthweight based centile charts (PBwCs). This project reviewed PBwCs between 3 different ethnic populations, applied the FGE to these populations and compared them to the current PBwCs. Methods: We analysed live singleton births over a 6-year period. From this data 10th, 50th, and 90th centiles were compared with existing Australian PBwCs. A validated FGE was then applied to generate centile charts in the 3 ethnic groups. Results: Of 23,060 births, 22,590 (98%) met inclusion criteria. 41% had an Australian, 18% South-East Asian (SEA), and 12% South Asian (SA) born mother. Our PBwCs were concordant with current Australian PBwCs across the gestational age range. SEA and SA infants were smaller than Australian infants, mean difference in term infants of 183g and 231g lower respectively: p < 0.001. FGE demonstrated significant discrepancies in the 10th centile between 25 – 34 weeks in comparison to PBwCs with FGE 10th centile weights 10-23% heavier. Conclusions: Ethnic differences exist across all birthweight centiles. FGE derived charts suggest that PBwCs systematically under diagnose SGA at earlier gestational ages in all ethnic groups. Ethnically appropriate FGE derived centile charts may improve risk stratification in the multiethnic population. Supporting information can be found in the online version of this abstract 10th centile comparison using the FGE applied to our Australian and SA data and most recently published Australian PBwCs. The Roberts and Lancaster study forms the basis for the current ASUM centile charts. OP08.02 Screening for SGA fetuses: one-year audit in high-risk pregnancy department. How good or bad are we? A. Boudy, J. Bouyou, S. Jaudi, M. Dommergues, J. Nizard Obstetrics and gynecology, GH Piti´ e Salpˆ etri` ere UPMC Paris 6, Paris, France Objectives: The aim of our study was to estimate our accuracy in screening for SGA, our false-positive-rate, and maternal and neonatal outcome. Methods: Retrospective monocentric study from January 1st 2012 to December 31st 2012. We collected maternal medical history, obstetrical history, current pregnancy data, fetal biometry for routine ultrasound scan and all additional scans, and maternal and neonatal outcome parameters. We included all pregnancies screened positive for SGA, whether true-positive or false-positive, and also included all SGA neonates detected only at birth. Results: On the 2450 deliveries, 134(5.6%) were screened positive for SGA, mostly at the 32WG routine scan, of which 90 were true-positive and 54 false-positive screenings. Another 90 neonates were SGA at birth, with an overall rate of SGA of 7.3%. The SGA screened positive and screened negative differed in obstetrical history (p = 0,04) and rate of preeclampsia during the current pregnancy (p < .01). Ultrasound sensitivity increased from 50% in the general population, to 76% when patients had a history or SGA, preeclampsia or PIH, to 82% when they had a preeclampsia. Median gestational age at delivery was 384/7 and 395/7 when SGA was screened positive or negative respectively. The overall emergency Cesarean rates and neonatal outcome did not differ between groups. Conclusions: Our antenatal detection rate of SGA was 50%, with 2.2% FP. True-positive cases had more often a history of SGA, preeclampsia, pregnancy induced hypertension, or a current preeclampsia. Ultrasound diagnosis of SGA reduces gestational age at birth by one week. OP08.03 Reduced fetal movements at term: association to second trimester uterine artery Doppler assessment G. Pagani, F. D’Antonio, A. Khalil, R. Akolekar, A. T. Papageorghiou, A. Bhide, B. Thilaganathan Fetal Medicine Unit, St George’s, University of London, London, United Kingdom Objectives: Recent studies have suggest that reduce fetal movements (RFM) are associated with poor placentation and a strong predictor of stillbirth at term. Second trimester uterine artery Doppler (UtA) Ultrasound in Obstetrics & Gynecology 2013; 42 (Suppl. 1): 48–112. 67