6 doctors weighed in:
What could cause fetal lower urinary tract obstruction?
6 doctors weighed in

4 doctors agree
In brief: Fetus urInary block
The most common cause of a fetus having lower urinary tract blockage would be a "posterior urethral valves".
This happens in boys and has a spectrum of presentation and treatments depending on the severity of the blockage and there may be issues with the bladder and kidneys because of the blockage. Because this issue can harm the fetus' lungs, your OB and. Pediatric urologist should be involved.

In brief: Fetus urInary block
The most common cause of a fetus having lower urinary tract blockage would be a "posterior urethral valves".
This happens in boys and has a spectrum of presentation and treatments depending on the severity of the blockage and there may be issues with the bladder and kidneys because of the blockage. Because this issue can harm the fetus' lungs, your OB and. Pediatric urologist should be involved.
Dr. Edward Cherullo
Dr. Edward Cherullo
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1 comment
Dr. George Klauber
Agree with Cherullo. Additional uncommon causes can be anterior urethral valves, Distal vaginal atresia or obstruction, Ectopic ureterocele
Dr. Alan Wartenberg
Addiction Medicine
1 doctor agrees
In brief: Many things
Anything that blocks the bladder outlet, preventing urine from passing through to the urachus, an organ found only in the fetus will cause a buildup of pressure which can ultimately damage the kidneys.
The urachus ultimately closes and undergoes degeneration after birth. Surgeons may have the ability to operate in the womb on the fetus to correct some of these conditions.

In brief: Many things
Anything that blocks the bladder outlet, preventing urine from passing through to the urachus, an organ found only in the fetus will cause a buildup of pressure which can ultimately damage the kidneys.
The urachus ultimately closes and undergoes degeneration after birth. Surgeons may have the ability to operate in the womb on the fetus to correct some of these conditions.
Dr. Alan Wartenberg
Dr. Alan Wartenberg
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Dr. Dennis Higginbotham
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