OP26.07: Outcome of fetal renal pyelectasis diagnosed during a routine second trimester screening ultrasound and a cut‐off value for its progression in utero

Methods: This was a prospective, cross sectional study. The study enrolled pregnant women, in the 2nd and 3rd trimester, undergoing a routine fetal ultrasound. The parenchymal measurements were done in transverse and sagital cross sections, using predefined criteria. Results: The final analysis included 128 women. The various measurements preformed (anterior and posterior parenchyma), in each of the cross sections (Sagital and transverse) did not show and difference between male and female fetuses. In the sagital section, there were no differences between the right and left kidney. The nomogram established demonstrates that there is a linear constant growth of the fetal parenchyma during pregnancy. Conclusions: This is a novel study, describing the normal growth of the renal parenchyma in healthy, non anomalous fetuses. This is the basis for future studies that will determine the correlation between parenchymal thickness and post natal kidney function, in fetuses with urinary tract anomalies.