16th World Congress on Ultrasound in Obstetrics and Gynecology Oral poster abstracts to the base of the contraction. The time was recorded automatically on the screen. Results: The mean pace of change in the thickness of the SFMC was 1.2 ± 0.8 mm/min. There was no statistically significant difference between the contraction’s and the relaxation’s phase pace. The maximum thickness measured was 45.7 mm, whereas 79% of the measurements where less than 35 mm. Conclusions: A total relaxation can be expected in the majority of the cases after 30 minutes if the SFMC is encountered during the relaxation phase. The SFMC can be distinguished from leiomyoma, to which it is similar in appearance, by measuring twice the thickness five minutes apart. OP02.10 Sonographically detected accessory placental lobe and pregnancy outcome M. C. Hoffman , G. Harinarayanan, F. Cruz-Pachano, A. Cotter, R. Romaguera, V. H. Gonzalez-Quintero University of Miami, United States Objective: Accessory placental lobe has been associated with post- partum complications such as post-partum hemorrhage (PPH). With the advent of routine ultrasound, the detection of accessory placental lobes has become more common. The objective of this study is to determine pregnancy outcomes with sonographically detected accessory placental lobes. Methods: A retrospective review of all women identified as having accessory placental lobes on routine sonograms performed at our institution was performed. Outcome variables such as estimated blood loss (EBL), rate of PPH, need for blood transfusion, or need for uterine curettage was assessed. Pathology reports were also reviewed to confirm sonographic diagnosis. Women without accessory lobe on ultrasound were used as controls. Results: Maternal demographics were similar between the two groups. No significant difference was noted with respect to EBL, rate of PPH, or other post-partum complications. Conclusion: Sonographically detected accessory placental lobes are not associated with increased post-partum complications. OP02.11 The spectrum and outcome of prenatally diagnosed fetal tumors D. Kamil 1 , J. Tepelmann 1 , C. Berg 1 , A. Heep 2 , R. Axt-Fliedner 3 , U. Gembruch 1 , A. Geipel 1 1 Department of Obstetrics and Prenatal Medicine, University of Bonn, Germany, 2 Department of Pediatrics, University of Bonn, Germany, 3 Department of Obstetrics and Gynecology L¨ ubeck, University of Schleswig-Holstein, Germany Objective: Fetal tumors are rare, but may have important implications for the management of pregnancy. Therefore, we thought to describe the spectrum, sonographic findings, in utero course and outcome of prenatally diagnosed tumors. Methods: Retrospective database search of two tertiary referral centers for prenatal medicine over a 10-year period (Bonn 1998–2006, L ¨ ubeck 1996–2006). Results: A total of 81 tumors were identified. Tumors involved the brain (3/81), face and neck (17/81), heart (18/81), abdomen (22/81), thorax (4/81) extremities (8/81) and sacrococcygeal region (9/81). Associated sonographic findings were fetal hydrops (5/81) and polyhydramnios (15/81). The most frequent histological classification was rhabdomyoma (17/81), followed by teratoma (13/81), lymphangioma (13/81) and hemangioma (12/81). The fetal outcome was termination of pregnancy (11/81), intrauterine fetal death (5/81), intrapartum death (1/81) and live born (64/81). Conclusion: Prenatal detection of fetal tumors enables a close surveillance of both, the mother and fetus, by a multidisciplinary team of specialists. This may reduce perinatal complications and improve outcome. Intrauterine treatment is a further option in selected conditions. OP02.12 Fetal structural abnormalities detected at the 11–14 week scan L. C. S. Bussamra 1 , E. Cordioli 2 , W. J. Hisaba 2 , F. M. Andrade 1 , R. M. Santana 1 , A. F. Moron 1 1 Hospital e Maternidade Santa Joana, Brazil, 2 Centro Paulista de Medicina Fetal, Brazil Introduction: Ultrasound (US) exam in the first trimester can allow the detection of lots of malformations, dysplasias, deformations and genetic syndromes, besides screening for chromosomal anomalies using nuchal translucency (NT), ductus venosus and nasal bone. Methods: A total of 5728 pregnant women referred to tertiary Fetal Medicine Centers (Centro Paulista de Medicina Fetal and Hospital e Meternidade Santa Joana – Sao Paulo – Brazil – between 11 and 13 6/7 weeks of gestation were submitted to an US exam, including anatomy and measurement of NT. All patients were followed until the end of gestation, when the sonographic findings were compared to the clinical and/or pathological findings. Isolated abnormal NT were not included. Results: The fist-trimester scan detected 161 structural anomalies (2.8%), with a detection of approximately 26.4% of the total cases of the patients who give birth to a neonate with any structural defect. The most frequent cases were: acrania/exencephaly, hidropsy, cystic hygroma, bladder outlet obstruction, omphalocele, gastroschisis, holoprosencephaly, Body-Stalk anomaly. Conclusion: The first-trimester US screening has a very good potential for detection of fetal structural abnormalities, but the second-trimester US screening remains important to improve the detection of structural abnormalities during the prenatal period. OP02.13 Comparison of 2D with 3D ‘reverse-face’ ultrasound assessment of isolated facial clefts B. Vijayalakshmi 1 , C. C. Lees 1 , P. Hall 1 , T. Ahmad 1 , S. Burton 2 , S. Campbell 2 1 Addenbrooke’s Hospital, Cambridge, United Kingdom, 2 Create Health Clinic, London, United Kingdom Objective: To assess the accuracy of 2D and 3D with ‘reverse face’ views in the characterization of suspected fetal lip, alveolar ridge and palate defects. Methods: Women referred to a regional cleft lip and palate prenatal diagnostic service from 2002–2006 after mid-trimester scan were scanned with a GE Kretz Voluson 730. Where facial cleft was confirmed, 2D, 3D and 3D ‘reverse face’ views were obtained and postnatal outcomes obtained from the surgical cleft database. Results: Of 55 women with apparently isolated facial clefts, one underwent termination without post mortem; 51 postnatal outcomes were available. In 46 of the 51 women, satisfactory 2D and 3D ‘reverse face’ views were obtained. The lip, alveolar ridge and palate lesion was correctly classified respectively in 43/46, 19/30 and 13/24 2D and 44/46, 30/30 and 22/24 3D with ‘reverse face’ ultrasound examinations. There were no false positive alveolar ridge diagnoses, but 4 false positive cleft palate on 2D, and 2 on 3D with ‘reverse face’ ultrasound. Conclusions: 3D with ‘reverse face’ views improved the accuracy of 2D ultrasound for the diagnosis of alveolar ridge and palate clefts, and appeared to reduce false positive cleft palate diagnoses. The technique was successfully applied to 46/51 women (90%), however sometimes necessitated a return appointment and required in most cases an extra 30 minutes scanning time to obtain satisfactory views. 424 Ultrasound in Obstetrics & Gynecology 2006; 28: 412–511