Although US remains the most widely used diagnostic imaging modality for routine evaluation of the fetus, MR imaging has become an invaluable complement to US in all cases in which additional information is desirable. While the ability of US to detect fetal abnormalities is limited in cases such as maternal obesity, oligohydramnios, and in certain fetal positions, MR using fast and ultra fast pulse sequences enables high-quality fetal images to be acquired regardless of the mother’s physical condition or fetal position.The purpose of our study was to determine whether fetal magnetic resonance imaging (MRI) provides additional information that might affect the obstetric management of pregnancies complicated by sonographically diagnosed fetal urinary tract anomalies.