This is a clinical feasibility study to assess the value of MR imaging for obtaining functional, dynamic and anatomical information in a comprehensive imaging protocol in subjects having obstructive uropathy. Patients who have been diagnosed with obstructive uropathy will be selected and these patients will have been preliminarily evaluated by other clinical imaging modalities to include CT, ultrasound, IVP, radionuclide scan, retrograde urography, plain x-ray, or others.