Lower urinary tract obstruction (LUTO), also known as bladder outlet obstruction (BOO), is a rare condition which occurs more commonly in males than females. LUTO is a blockage either at the base of the bladder or at the urethra, which is the tube that drains urine from the bladder. Depending on the severity of the blockage, the drainage of urine can either be slowed or completely stopped.
If the urine cannot drain properly, there may be problems before and after the blockage:
LUTO can be detected on prenatal ultrasounds by looking at the size and shape of the kidneys, bladder and urethra, as well as the amount of amniotic fluid. Sometimes, additional ultrasounds or other imaging like Fetal MRI is recommended to better understand the problem.