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I am 13 weeks pregnant. in my echo dr found out my baby has a big bladder measuring 15.5mm. what are the chances to go all through the pregnancy and deliver a baby with normal kidneys?
14 يوليو 2013
-bladder diameter > 7 mm in the first trimester
-bladder diameter > 30 mm in the second trimester
-bladder diameter > 60 mm in the third trimester.
It is estimated to occur in 1:1500 of antenatal imaging.
Associated anomalies are common and include:
-posterior urethral valves
-chromosomal anomalies:
on a first trimester scan ( 10 - 14 weeks), if the longitudinal bladder diameter of 7 - 15 mm there is a risk of a chromosomal defects is esimated at ~ 25%; if the bladder diameter is > 15 mm the risk of chromosomal defects is estimated at ~ 10%
-oligohydramnios
-megacystis microcolon intestinal hypoperistalsis (MMIH) syndrome (Berdon syndrome)
-megacystis megaureter syndrome
-prune belly syndrome
If the fetus is chromosmally normal and there is megacystis on the 1st trimester scan, there is spontaneous resolution of the megacystis in about 90% of cases when the 1st trimester longitudinal bladder diameter is between 7 - 15 mm. If the bladder diameter is > 15 mm there is a very high likelihood of associated with progressive obstructive uropathy.
Management will depend on the underlying pathology.
Due to limited characters here, I did not go through every pathology in detail- kindly discuss them with your physician and explore all your options for management.
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