Six cases of undifferentiated embryonal sarcoma (UES) were reviewed to determine their characteristic features on ultrasonography (US) (n = 5) and computed tomography (CT) (n = 6). US demonstrated a single large, echogenic mass with some anechoic spaces. Contrast-enhanced CT scan revealed a well-demarcated low-attenuation mass with hyperdense septations of variable shape and thickness. Discrepancy of internal architecture on US and CT was one of the important characteristics of UES. CT numbers were 25-47 HU in low-attenuation areas. Enhancing peripheral rim was found in four cases and some solid portions at the periphery or adjacent to the septa were found in all cases. Two patients who had follow-up US and CT without treatment showed enhancing solid portions, changing to hypodense as the tumor grew. When compared with the pathologic findings, US showed a more accurate representation of internal architecture than did CT. Familiarity with these US and CT findings of UES of the liver will be helpful in the differential diagnosis of primary hepatic tumors in childhood.

BACKGROUND AND PURPOSE:For the postoperative follow-up in pediatric patients with Moyamoya disease, it is essential to evaluate the degree of neovascularization status. Our aim was to quantitatively assess the neovascularization status after bypass surgery in pediatric Moyamoya disease by using color-coded digital subtraction angiography.

We present the CT findings of pulmonary paragonimiasis in a 9-year-old girl. It appeared as a large cystic mass with an air-fluid level and simulated a lung abscess. Communication with a segmental bronchus was demonstrated well on a CT scan obtained after aspiration.

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17th World Congress on Ultrasound in Obstetrics and GynecologyPoster abstracts routine ultrasound. A bilateral renal disease with oligohydramnios was diagnosed in her first pregnancy and the baby was stillborn with Potter sequence. In the actual pregnancy the ultrasound done at 26 + 4 weeks of gestation showed right pyelocalicial and proximal ureteral dilatation with narrowing. In the neonatal period a 3D scan with multiplanar views demonstrated a megaureter associated with ureteral valve and a distal ureteral stenosis. The diagnosis was confirmed via surgical exploration and histology. While rare this might be a cause of ureteral obstruction with progressive upper tract dilatation. We emphasize the value of multiplanar 3D which allowed a diagnosis that only few years ago was privative of excretory urography. P26.20 Seoul National University College of Medicine, Republic of KoreaUrethral duplication is very rare condition and a few prenatal cases were reported. We have experienced a case of anterior urethral duplication with hypospadia and bladder outlet obstruction detected on the prenatal ultrasound. A 36-year old pregnant woman underwent a targeted ultrasound exam due to dilatation of bilateral fetal renal pelves at 31-week gestation. Ultrasound exam revealed dilatation of bilateral renal pelvis and ureters. Periodic changes of renal pelvic and ureteral diameters suggested vesicoureteral reflux. The urinary bladder was dilated during more than two hours suggesting bladder outlet obstruction, but posterior urethral dilatation was not detected on the prenatal ultrasound. During the fetal urination, the urine flow through the anterior urethra was divided into upper and lower flows on the color Doppler ultrasound, suggesting anterior urethral duplication. Postnatal exam revealed two urethral orifices and duplicated anterior urethra. The upper urethral opening was normally located, but the lower opening was on the ventral surface. Bilateral renal pelvis dilatation and high grade vesicoureteral reflux due to posterior urethral valve were confirmed on the voiding cystourethrography. P26.21Multiple congenital anomalies syndrome with urorectal septum malformation, absent radii, cerebellar vermis aplasia: case report University of Cagliari, ItalyIn this report we present the case of a male fetus, son of healthy nonconsanguineous parents, diagnosed with an apparently unknown multiple congenital anomalies syndrome by 2D ultrasound prenatal examinations. At 15 weeks, a 2D ultrasound examination revealed a huge distended bladder and the deviation of both hands. It had not been performed any pregnancy exam, previously. Genetic counselling excluded familiarity for malformations or genetic diseases, as far as a maternal exposure to teratogens. The fetus had a normal male caryotype, investigated by GTG cytogenetic analysis on amniocytes. At 18 weeks, 2D ultrasound pointed out a distended bladder, hydronephrosis, dolichocephaly, cerebellar vermis hypoplasia, anhydramnios. The pregnancy was terminated. On autopsy the distended ...