3–7 September 2006, London, UK Poster abstracts cyst either prior to or immediately following delivery. Prenatal and postnatal management issues will be presented along with the neonatal outcome. P09.13 Two- and three-dimensional sonographic and MRI assessment in a case of neck masses D. C. Prete , A. Perre, A. P. G. Capellari, F. M. Sobrinho Londrina University, Brazil We report the prenatal findings of cystic hygroma. Nuchal cystic hygromas are characterized by single or multiple congenital cystics of the lymphatic system, most found within the soft tissues of the neck. Embriology are the clinical consequence of a delay or absence of the communications that normally develop between the jugular lymph sacs and the internal jugular veins; the obstucted jugular lymph sacs dilate along the paths of least resistence into the posterior and lateral cervical areas. A 26-year-old woman, gravida 1, was referred at 24 weeks gestation to our department from another hospital where sonographic diagnosis of neck masses had been made. Two- and three-dimensional sonographic confirmed the presence of a large cystic areas with septa termed cystic hygroma develop within the skin in the right lateral aspect of the neck, without other malformations. Examination in utero using Magnetic resonance imaging (MRI) had been made to study this case. P09.14 Relationships between pregnancy rates following in vitro fertilization or intracytoplasmic sperm injection and endometrial thickness and pattern M. Sadeghi , B. Hossein Rashidi, M. Jafarabadi, E. Shahrokh Tehraninejad Valiasr Reproductive Health Research Center, Islamic Republic of Iran Objective: To investigate the role of endometrial thickness and pattern on day of human chorionic gonadotropin (hCG) administration on in vitro fertilization (IVF)/intracytoplasmic sperm injection (ICSI) outcome. Study Design: A total of 150 infertile women undergoing embryo transfer after IVF/ICSI cycles were studied in a prospective survey. Sonographic features of the endometrium (thickness and pattern) on the day of hCG administration, hormonal profile (progesterone, estradiol, FSH, LH) and various other variables (maternal age, causes and duration of infertility, duration of treatment, number of human menopausal gonadotropin (hMG) ampoules administered, and number of oocytes retrieved) were evaluated. These variables in pregnant and non pregnant patients were compared. Results: There was no difference between pregnant and non pregnant patients in mean endometrium thickness (10.1 ± 1 versus 10.2 ± 2, p = 0.79). Pregnancies occurred only in patients with an endometrial thickness of 9–12 mm (p = 0.036). Duration of treatment, number of hMG ampoules administered, and number of oocytes retrieved, estradiol concentration, and estradiol/progesterone ratio on the day of hCG administration differed significantly between pregnant and non pregnant patients. The receiver-operating characteristic (ROC) curve and multiple logistic regressions showed no significant effect of endometrial thickness in outcome of IVF/ICSI. Conclusion: The sonographic features of endometrium (thickness and pattern) on the day of hCG administration did not differ between pregnant and non pregnant patients. The pregnancy rate declined beyond two limits of endometrial thickness. P09.15 Three- and four-dimensional ultrasound: when and how to obtain the best images? C. Comas 1 , G. Azumendi 1 , I. Alonso 1 , J. R. Herrero 1 , M. Romero 1 , J. Anderica 1 , A. Calvo 1 , I. Narbona 1 , F. Rius 2 , R. Hidalgo 2 1 Gutenberg Center, Spain, 2 University of Malaga, Spain Objective: To explore several factors impact, particularly the gestational age (GA), fetal conditions and previous sonographer’s experience, on the three- and four-dimensional ultrasound (3/4DUS) success. Methods: An overall of 1000 routine prenatal scans were included, randomized selected, considering any GA or indication for referral. Scans were performed in our private Unit with Voluson 730 Expert by nine experts in 2D with different levels of expertise in 3/4DUS. Data were collected from a questionnaire immediately after the sonographic examination. Results: - Considering the impact of GA, the highest quality image scores were obtained at early third trimester (59%), followed by first trimester, late third trimester, second trimester, and early second trimester. – Related to the impact of physician’s experience, the highest quality scores were obtained by the most experienced group (65% in Level III, 51% in Level II and 43% in Level I, p < 0.001). – According to fetal conditions during the exploration, the highest quality scores were obtained in 58% of cases in cephalic presentation (51% in breech presentation and 28% of transverse presentation, p = 0.001), 68% in posterior spine (51% in lateral spine, 44% in anterior spine, p < 0.001) and 100% in polyhydramnios (55% in normal amniotic fluid and 14% in olygohydramnios, p = 0.005). – No statistically significant correlation between body mass index and quality images was observed. Conclusions: The highest quality scores were obtained at early third trimester, cephalic presentation, posterior spine and poly- or normoamnios. No statistically significant correlation between body mass index and quality images was observed. Statistically significant positive correlation between level of expertise and quality images was observed. P09.16 Maternal attitudes towards three- and four-dimensional ultrasound during pregnancy J. R. Herrero 1 , C. Comas 1 , G. Azumendi 1 , I. Alonso 1 , M. Romero 1 , J. Anderica 1 , A. Calvo 1 , I. Narbona 1 , F. Rius 2 , R. Hidalgo 2 1 Gutenberg Center, Spain, 2 University of Malaga, Spain Objective: To explore women’s perception and attitudes towards three- and four-dimensional ultrasound (3/4DUS) during pregnancy. Methods: An overall of 1000 routine prenatal scans were included, randomized selected, considering any gestational age or indication for referral. Scans were performed in our private Unit between August 2005 and March 2006, with Voluson 730 Expert (GE Medical System). After a 2D detailed examination of the fetal anatomy, 3/4DUS was obtained in all cases. Patients were given a medical report, copies of the 3D images obtained and a video-tape to take home with examination recorded. Data were collected from a questionnaire immediately after the sonographic examination. Results: – In response to satisfaction level, 99% of patients were satisfied with the 3/4DUS. – According to the main feelings after the 4D scan, 86% describe tranquillity, 75% emotion, 45% closer prenatal contact with the baby, 41% more precise image of the baby. – In response to how they measure different issues, the most important aspects are to reassure the normality of the baby (medical report) (88%) and the perception of a more complete examination of the baby (75%). – An excellent or good image quality is perceived by the 99% of cases. – Comparing 3/4D versus Ultrasound in Obstetrics & Gynecology 2006; 28: 512–614 579