What causes neonatal hydronephrosis?
The following are possible causes of neonatal hydronephrosis: Obstruction: A blockage of urine flow which can occur somewhere along the urinary tract may cause hydronephrosis. The blockage is usually a narrowing or kinking of the ureters.Reflux: This happens when urine travels back up to the kidney. This often occurs when the muscles at the junction of the ureter and bladder do not work properly.Others: These may include having fluid-filled cysts in the kidneys. Problems since birth may cause neonatal hydronephrosis. These may include problems such as having two ureters from one kidney or ureters draining outside the bladder.