ESPU Congress 2018 - Abstract Book

125 11–14 APRIL, 2018, HELSINKI, FINLAND 10:22–10:25 S15-3 (PP) EVOLUTION AND POSTNATAL OUTCOME OF PRENATALLY- DIAGNOSED SIMPLE RENAL CYSTS Stavros LOUKOGEORGAKIS  1 , Elisabetta SANNA  2 , Ingrid DERWIG  2 , Gauri PARAMASIVAN  2 , Christoph LEES  2 and Marie-Klaire FARRUGIA  1 1) Chelsea and Westminster Hospital, Paediatric Urology, London, UNITED KINGDOM - 2) Queen Charlottes and Chelsea Hospital, Centre for Fetal Care, London, UNITED KINGDOM PURPOSE To establish pre- and post-natal evolution and outcome of prenatally-diagnosed simple renal cysts. MATERIAL AND METHODS We retrospectively reviewed all prenatally-diagnosed simple renal cysts (2005–2016) in a single tertiary fetal centre, using the Astraia Obstetrics database (Astraia Software Gmbh). The diagnosis was based on the presence of a solitary, non-septated non-commiunicating cyst in an otherwise normal kidney. Gestational age (GA), location and size of the renal cyst at diagnosis and subsquesnt scans were recorded. Fetuses were delivered locally. Following ethical approval, we reviewed postnatal scans and patient records at each hospital. RESULTS Renal cysts were indentified in 31 fetuses at a median GA of 23 (20–36) weeks. Cysts were bilateral in 3 fetuses (9.6 %) and unilateral in 28 fetuses (90.4 %) with equal left/right distribution. Median maximum diameter was 15 (4–35) mm. Antenatal cyst resolution was observed in 4 fetuses (12.9 %), and the diagnosis was modified in 5 (16.1 %) to hydronephrosis (3), adrenal mass and echogenic kidney. Postnatal follow-up data was available for the remaining 22 patients. Eight cysts (36.4 %) resolved; whereas 3 (13.7 %) persisted and were managed conservatively for a median 51 (39–60) months. In the remaining 11 (50 %), postnatal findings were MCDK (3), duplex kidney with dilated upper moiety (3), adrenal mass (3) patients and unilateral renal agenesis (2). CONCLUSIONS Our study suggests caution when counselling for prenatally-diagnosed renal cysts as in over half the cases postnatal investigation reveals alternative diagnoses such as a cystic duplex or adrenal mass which may require further investigation. It is also interesting to note that the cyst may be a part of an involuting MCDK resulting in postnatal renal agenesis. 10:25–10:34 Discussion

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