Hi i just went in for my nt ultrasound on the 6th. I had a regularly scheduled ultrasound two weeks ago and the dr says the baby looks fine. Now on the 6th the nt ultrasound Dr tells me the baby has megacystis with a bladder that is 4cm. How accurate could this ultrasound be and how was there no detection of a distended abdomen 2weeks ago? Also on new years day i was admitted to the hosp for food poisoning/dehydration and given 4L of iv fluid. Could this have had any affect on the nt ultrasound or my baby s abdomen?
Hello, and I hope I can help you today.It will take a while for your OB to figure out why your baby has an enlarged bladder, but i want to first assure you that it has nothing to do with any fluids you received when you had food poisoning.Fetuses get hydration from drinking amniotic fluid, and do make their own urine.  If there is a blockage of the bladder opening, then the fetus cannot pass urine and that can cause the bladder to look very large and full on an ultrasound scan.  The most common cause of a blocked urinary tract in utero is posterior urethral valves, which are more common in male infants.  Of course, if you do an ultrasound when the bladder of the baby is just full, it can be mistaken for an enlarged bladder.So in summary, the enlarged bladder will need further evaluation by your OB but your fluid intake does not affect the baby's fluid intake or production of urine.I hope I was able to answer your question today and that my advice was helpful.Best wishes,Dr. Brown