Renal pelvis dilation

Amanda
I'm 35 weeks today. Had a ultrasound for growth due to measuring ahead. They found an issue with my baby boys renal pelvis. Just curious if anyone else had this problem. The doctor didn't seem to concerned about it. Said once he is born he'll need an ultrasound of his kidneys. He is measuring in the 95th percentile for his estimated weight 6lbs 10 oz.