Fetal Surgery

What is fetal surgery?

Fetal surgery is a group of operations performed on a baby before birth, while the baby is still in the womb (uterus). The aim is to treat a serious birth defect or complication that is likely to cause death or severe, lasting harm if treatment waits until after delivery. Because the operation involves two patients at once, the pregnant person and the fetus, it is carried out by a specialized team that usually includes maternal-fetal medicine specialists (obstetricians trained in high-risk pregnancy), pediatric surgeons, anesthesiologists, neonatologists (doctors who care for newborns), and specialist nurses.

There are three broad types of fetal surgery procedure:

• Open fetal surgery: the surgeon makes an incision in the abdomen and uterus, similar to a cesarean section, operates on the baby, and then closes the uterus so the pregnancy can continue.
• Fetoscopic surgery: a thin telescope (fetoscope) and fine instruments are passed through small openings in the abdomen and uterus, guided by a camera and ultrasound.
• Ultrasound-guided (percutaneous) procedures: a needle or thin tube is guided into the uterus using ultrasound alone, for example to place a shunt (a small drainage tube) or give a blood transfusion to the baby.

Conditions that may be treated with fetal surgery include spina bifida (an opening in the spine, most often the form called myelomeningocele), twin-twin transfusion syndrome (an unequal sharing of blood between identical twins who share a placenta), congenital diaphragmatic hernia (a hole in the muscle between chest and abdomen that lets organs press on the developing lungs), lower urinary tract obstruction (a blockage that stops urine leaving the bladder), certain lung masses, some tumors such as sacrococcygeal teratoma (a growth near the base of the spine), severe fetal anemia, and amniotic band syndrome (bands of tissue that wrap around and constrict a limb). Not every case of these conditions needs surgery before birth; many are managed after delivery.

Who is a candidate: who needs fetal surgery

Deciding who needs fetal surgery is a careful, individual process. In general, a pregnancy may be considered when all of the following apply:

• The baby has a condition that is expected to worsen before birth or cause death or major disability, and for which early treatment is likely to change the outcome.
• Detailed imaging, such as high-resolution ultrasound and fetal MRI (magnetic resonance imaging, a scan that uses magnets rather than radiation), confirms the diagnosis and shows that the problem is severe enough to justify the risks.
• Genetic testing, usually through amniocentesis (sampling the fluid around the baby), has not found an additional chromosomal condition that would limit the benefit of surgery.
• The pregnancy is at a gestational age (stage of pregnancy) within the window in which the specific operation has been studied and is offered, often roughly between the late second trimester and the early third trimester, depending on the procedure.
• The pregnant person is healthy enough for anesthesia and surgery, and there is a single baby or, for twin procedures, a shared-placenta twin pregnancy.

Fetal surgery is generally not suitable when the baby has multiple major abnormalities, when the condition is mild enough to be treated safely after birth, when the pregnant person has a medical condition that makes surgery too dangerous (for example, uncontrolled high blood pressure, a very short or weakened cervix, or certain uterine problems), or when the pregnancy is already too advanced for prenatal treatment to add benefit. The specialist team will also explain the alternative of planned delivery with immediate newborn surgery, which is the standard choice for many conditions.

How the procedure works

The exact steps depend on the type of fetal surgery procedure, but most follow a similar pattern.

Before the operation. The team completes a full evaluation over one or several days: detailed ultrasound, fetal echocardiography (an ultrasound of the baby’s heart), MRI when helpful, blood tests, and counseling sessions in which the risks and benefits, alternatives, and expected course are discussed. Medicines to relax the uterus (tocolytics) are often started, and in some cases steroids are given to help the baby’s lungs mature in case of early delivery.

During the operation. In open fetal surgery, the pregnant person usually receives general anesthesia, which also relaxes the uterus and reaches the baby through the placenta. The surgeon opens the abdomen, uses ultrasound to locate the placenta and position the baby, and opens the uterus away from the placenta. Only the part of the baby that needs treatment, such as the back for spina bifida repair, is exposed. The baby may receive additional pain medicine and a muscle relaxant by injection. After the repair, warm fluid is replaced in the uterus, and the uterus and abdomen are closed in layers. In fetoscopic and ultrasound-guided procedures, regional anesthesia (a spinal or epidural that numbs the lower body) or local anesthesia with sedation is more common. Small openings are made, instruments are passed in under camera or ultrasound guidance, and the treatment is carried out, for example sealing abnormal blood vessels on the placenta with a laser, placing a balloon in the baby’s windpipe, or inserting a shunt. Procedures typically take between about one and four hours.

After the operation. The pregnant person recovers in a monitored unit where contractions, the baby’s heart rate, and the amount of amniotic fluid are checked closely. Medicines to prevent preterm labor are usually continued, and pain is managed with an epidural or oral medicines. The pregnancy then continues under close surveillance until delivery, which after open surgery is almost always by planned cesarean section.

Preparation for fetal surgery

Preparation begins with referral to a center that has a dedicated fetal treatment program. At Acibadem, this evaluation is coordinated through the Perinatology (High-Risk Pregnancy) Department, working with pediatric surgery and neonatal teams. Practical preparation commonly includes:

• Bringing all previous scan reports, genetic test results, and medical records so that the team can confirm the diagnosis and the stage of pregnancy.
• Reviewing all medicines and supplements; some may need to be paused or adjusted before surgery.
• Fasting from food and drink for the period the anesthesia team specifies, usually from the night before.
• Arranging to stay near the hospital for several weeks after the procedure, since frequent monitoring is needed and early delivery is possible.
• Planning support at home, because strict activity limits often continue for the rest of the pregnancy.
• Meeting a counselor or social worker, which many programs offer to help families weigh a difficult decision.

It is reasonable to ask the team how many of these procedures they perform, what their approach to anesthesia and pain control is, and how they will manage delivery and newborn care afterward.

Recovery and aftercare: fetal surgery recovery time

Fetal surgery recovery time has two parts: the pregnant person’s recovery from the operation, and the remaining weeks of pregnancy, which are treated as high risk.

Hospital stay. After open fetal surgery, a stay of several nights, often around four to seven, is typical so that contractions and fluid levels can be monitored and medicines adjusted. After fetoscopic or needle-based procedures, many patients go home within one to two nights, depending on how the uterus responds.

The first weeks. Discomfort at the incision sites usually improves over one to two weeks. Most people are asked to rest at home, avoid lifting, exercise, sexual activity, and long periods of standing, and attend ultrasound checks often, sometimes weekly. Remaining close to the hospital for a defined period is commonly recommended.

The rest of pregnancy. Because the uterus has been operated on, there is a higher chance of the membranes rupturing early, preterm labor, and reduced amniotic fluid. Delivery is often planned earlier than the usual due date, and after open surgery a cesarean delivery is required for this and all future pregnancies. The interval between pregnancies is usually longer than after an ordinary cesarean, and your doctor may advise waiting at least around two years.

The baby after birth. Fetal surgery treats the condition before birth but does not remove the need for newborn care. Many babies still require time in a neonatal intensive care unit, further operations, or long-term follow-up with specialists such as neurosurgeons, urologists, or physical therapists.

Risks and side effects

Understanding fetal surgery risks and benefits honestly is central to the decision. Risks to the pregnant person include the general risks of anesthesia and abdominal surgery (bleeding, infection, blood clots, reaction to medicines), side effects of uterus-relaxing drugs such as fluid on the lungs, and a weakened uterine scar that can separate or rupture in this or a later pregnancy. Some people also experience emotional strain related to prolonged bed rest, uncertainty, and separation from family.

Risks to the pregnancy and baby include:

• Preterm birth: the most common complication; babies born early face problems with breathing, feeding, and development that are related to prematurity itself.
• Premature rupture of membranes: leaking of amniotic fluid before labor, which increases the chance of infection and early delivery.
• Placental abruption: the placenta separating from the uterine wall, which is an emergency.
• Chorioamnionitis: infection of the membranes and fluid around the baby.
• Fetal death: uncommon but possible, either during the procedure or in the weeks that follow.
• Incomplete treatment: the condition may not be fully corrected, and further surgery after birth may still be needed.

Minimally invasive procedures generally carry fewer maternal risks than open surgery but are not free of them; membrane rupture, in particular, remains a concern.

Results and outlook

The evidence base varies by condition. For myelomeningocele, a large randomized clinical trial found that prenatal repair, compared with repair after birth, reduced the need for a shunt to drain fluid from the brain and improved motor function in early childhood, at the cost of higher rates of preterm birth and uterine complications. For severe twin-twin transfusion syndrome, laser treatment of the shared placental blood vessels is widely regarded as the standard of care and improves survival compared with earlier approaches. For severe congenital diaphragmatic hernia, fetoscopic tracheal occlusion has shown improved survival in selected severe cases in clinical trials, again with an increase in early delivery. For other conditions, such as urinary tract obstruction and lung masses, results are more mixed and depend heavily on careful selection.

Fetal surgery does not cure the underlying condition in most cases. Children who have had spina bifida repair, for example, may still have some weakness, bladder or bowel problems, or learning differences, and long-term outcomes continue to be studied. The most reliable predictor of a good outcome is careful case selection at an experienced center, combined with coordinated care after birth.

Cost considerations

Fetal surgery is among the more resource-intensive areas of medicine, and total costs are influenced by several factors rather than by a single procedure fee. These typically include the extent of the pre-operative evaluation (advanced imaging, genetic testing, and multiple specialist consultations), the type of operation (open surgery generally requires longer operating time and a longer hospital stay than fetoscopic or needle-based procedures), the devices used (such as shunts, balloons, or laser equipment), the length and intensity of maternal monitoring after the procedure, accommodation if a family must stay near the hospital for weeks, the mode and timing of delivery, and the newborn’s stay in a neonatal intensive care unit, which can be prolonged. Follow-up care for the child over several years should also be considered. Coverage rules differ widely between insurers and countries, and confirming what is included before treatment is advisable.

Frequently asked questions

What is fetal surgery and how is it different from newborn surgery?

Fetal surgery treats a baby before birth, while the baby is still in the uterus, whereas newborn surgery is performed after delivery. Operating before birth is considered only when waiting is expected to cause irreversible harm, because it adds risks for the pregnant person and the pregnancy that newborn surgery does not carry.

Who needs fetal surgery?

Only a small number of pregnancies with birth defects are candidates. Generally, the baby must have a severe, progressive condition that has been studied in fetal treatment programs, no additional major genetic abnormality, and the pregnancy must fall within the appropriate stage. A maternal-fetal medicine team makes this assessment case by case, and many families are advised that surgery after birth is the safer choice.

How long does a fetal surgery procedure take?

Most procedures take roughly one to four hours, with ultrasound-guided needle procedures at the shorter end and open surgery at the longer end. The time spent in preparation, anesthesia, and recovery adds to the total day, and the hospital stay afterward ranges from about one night to a week depending on the approach.

What is the typical fetal surgery recovery time?

Recovery from the operation itself often takes a few weeks, but the rest of the pregnancy is treated as high risk, with activity restrictions, frequent scans, and a planned early delivery. Full recovery for the pregnant person is usually judged after delivery, and the baby’s recovery depends on the condition treated and on how early birth occurs.

What are the main fetal surgery risks and benefits?

The potential benefit is a better chance of survival or of reduced long-term disability for the baby, depending on the condition. The main risks are preterm birth, early rupture of membranes, infection, placental separation, and, for open surgery, a uterine scar that requires cesarean delivery in future pregnancies. Your doctor should discuss how these balance for your specific situation.

Can the baby feel pain during fetal surgery?

Anesthesia given to the pregnant person crosses the placenta and reaches the baby, and in open procedures the baby often receives additional pain medicine and a muscle relaxant directly. Anesthesia teams plan for the comfort and safety of both patients.

Does fetal surgery guarantee a healthy baby?

No. Fetal surgery can improve outcomes for selected conditions, but it does not guarantee any particular result, and most treated children still need medical care and follow-up after birth. Outcomes vary with the severity of the condition, the timing of surgery, and whether the pregnancy reaches a safe gestational age.

When to see a doctor

If a routine pregnancy ultrasound has shown a possible birth defect, ask for referral to a maternal-fetal medicine specialist for detailed imaging and counseling; timing matters, because the window for prenatal treatment is limited. Also seek specialist assessment if you are carrying identical twins and have been told they share a placenta, if scans show unusually high or low amniotic fluid, or if you have had a previous pregnancy affected by a condition that can be treated before birth.

After fetal surgery, contact your care team or go to the emergency department right away if you notice any of the following:

• Regular tightening or cramping of the abdomen, or pain that is increasing rather than improving.
• Fluid leaking from the vagina, or any vaginal bleeding.
• Fever, chills, or foul-smelling vaginal discharge.
• A noticeable decrease in the baby’s movements once you have been feeling them regularly.
• Redness, swelling, or discharge at the incision sites.
• Shortness of breath, chest pain, or swelling and pain in one leg, which can signal fluid on the lungs or a blood clot.
• Severe headache, visual changes, or sudden swelling of the face and hands.

These symptoms do not always mean something serious is happening, but after fetal surgery they need prompt evaluation by a specialist rather than waiting for the next scheduled visit.