We had our 20 week ultrasound done in December and we have to go back in 4 weeks for a follow-up because fluid was showing in one of the kidneys and they want to check that it isn't an issue. She said not to worry about it that it was nothing major, but now my Dr. said it could be Pyelectasis, but that he has only seen 1 case of this in 5 years. He also said that it is a weak marker for Down Syndrome. Has anyone else had this come up during their ultrasound? He has me worried now that our baby may have DS.