Genetics : There are many causes of hydronephrosis. Often hydronephrosis is found on prenatal ultrasounds but is not seen on postnatal ultrasounds. Any kidney or bladder malformation can cause hydronephrosis. In infants, posterior urethral valves, kidney stones, cystic kidneys, abdminal masses or any stenosis of the urethra or ureters may cause hydronephrosis.
Answered 8/19/2017
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