In unborn babies, this condition can be diagnosed by an ultrasound scan of the expecting mother. Hydronephrosis does not usually affect the pregnancy, and the delivery should proceed as planned. The condition will then be confirmed by a repeat ultrasound of the baby’s kidney on the second or third day of life. On an ultrasound the kidney tissue may be distended and squashed, and the urine drainage system will appear very ballooned and dilated.
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