OP33.08: Prenatal diagnosis of renal duplex systems. Ultrasonographic features and postnatal outcomes

Abstract

To assess the accuracy of ultrasound diagnosis of duplex renal systems and to describe the natural history of prenatally diagnosed duplex systems. Observational retrospective study of cases with antenatal diagnosis of duplex system. The ultrasound features leading to the suspicion of duplex system included: a) identification of two separate renal poles, b) dilatation or cystic areas in an upper or lower pole, c) dilated ureter and d) cystic anechoic structure within the bladder suggesting ureterocele. Results of postnatal follow-up were obtained from hospital records. Of a total of 24 cases of suspected duplex systems 22 were followed until complete postnatal diagnosis. Duplex system was confirmed in 95.4% (21/22). Presence of two separate dilated renal poles was the most prevalent ultrasound feature followed by dilatation of a single pole in addition to ipsilateral dilated ureter and / or ureterocele. In half of the cases (47.6%) duplex systems had a benign course but in 38.1% urinary tract infection occurred and in 29% some kind of surgical procedure was needed. Duplex systems can be accurately diagnosed when there is even minimal pelvis dilatation. Antenatal diagnosis allows planning of postnatal care with a high accuracy. The natural history of prenatally diagnosed duplex systems seems to be essentially benign within the available follow up. Supporting information can be found in the online version of this abstract. Images of duplex systems, dilated ureter and ureterocele. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.