Hello Thanks for query. The word Hydrouretero-Nephrosis suggests dilatation of ureter and kidney due to obstruction to flow of urine down into bladder .. In most of the cases this obstruction is due to impacted stone in the ureter and few cases due to pressure over ureter from outside due to swollen lymph node or blood vessel crossing the ureter. You need to get radiological test called Intra Venous Pyelography(I.V.P.) done to find out the level of obstruction ,degree of obstruction and effect of this obstruction on function.of the kidney.so as to decide future course of action and to save kidney from further damage. Consult Urologist for evaluation .Further treatment will be decided by him based on the report of this test. Dr.Patil.