In brief — the direct answer
Fetal cystoscopy uses a small endoscope to examine the fetal bladder and, in selected lower urinary tract obstruction cases, attempt treatment of the blockage. It is a specialist procedure with uncertain long-term benefit and important maternal and fetal risks. Opening an obstruction does not reverse kidney damage already present or guarantee normal kidney function.
What is Fetal Cystoscopy?
The procedure utilizes the world's smallest medical endoscopes, often less than 1mm in diameter.
During the surgery, we navigate into the baby's bladder under ultrasound guidance. Once inside, we can see the internal anatomy in high definition. If we confirm the presence of PUV, we perform a 'Hydro-ablation' or use a laser to clear the airway. This restores the natural pathway of urine, which is physiologically superior to a permanent shunt because it doesn't leave a foreign object in the baby's body.
Who is at risk?
Candidates for cystoscopy are typically male fetuses with signs of 'Keyhole' bladder on ultrasound and who have good prognostic urine markers (dilute urine). The procedure is ideally performed between 18 and 24 weeks of pregnancy. It is more technically demanding than shunting and is only performed at specialized fetal therapy centers like the MFM Unit.
How we diagnose it
Selection requires specialist ultrasound, assessment of fluid and kidneys, exclusion of relevant associated conditions and multidisciplinary counselling. Bladder or urine testing has limitations and cannot prove that the kidneys are healthy enough to benefit. The feasibility of cystoscopy depends on anatomy, gestation and technical access.
What does management involve?
The procedure is performed under local anesthesia and sedation:
- Access: A thin trocar is passed into the baby's bladder.
- Visualization: The 1mm fiber-optic scope is inserted. The surgeon views the bladder neck and the valves on a monitor.
- Intervention: The valves are disrupted using specialized micro-tools. The surgeon confirms the urine flow has been restored before withdrawing the scope.
- Safety: Because the entry site is so small, the risk to the mother is minimal, and the procedure usually takes less than an hour.
What are the outcomes?
Some obstructions can be treated, but the procedure may fail or require further intervention. Kidney and bladder dysfunction can persist, and postnatal urological care remains necessary. Discuss the uncertainty in comparison with shunting or postnatal care, as well as membrane rupture, prematurity, infection, bleeding and fetal loss.
When to see a subspecialist
Refer suspected LUTO promptly to a specialist fetal-therapy team for assessment of cause, renal appearance, fluid and eligibility. Counselling should include conservative and postnatal pathways and the limits of available evidence.