Fetal surgery for spina bifida outcomes from Asian perinatal centers

Spina bifida remains one of the most consequential congenital anomalies compatible with survival, with myelomeningocele the most common and severe form requiring postnatal closure. In the past decade, prenatal repair has moved from experimental intervention to a recognized option for selected pregnancies following the Management of Myelomeningocele Study. Across Asia, several high-volume perinatal centers in Tokyo, Seoul, Beijing, Shanghai, Singapore, and Taipei have built structured programs offering both open hysterotomy and fetoscopic patch closure, contributing data that helps families and clinicians weigh a new diagnosis with greater clarity.

For clinicians in Australia, where domestic fetal surgery capacity remains limited and interstate travel to Brisbane or Sydney is often required for prenatal evaluation, understanding the Asian experience is increasingly relevant. Some Australian families historically pursue treatment abroad, and clinical teams in Melbourne and Perth regularly coordinate with overseas colleagues. This article reviews current surgical approaches, reports outcomes from leading Asian centers, and considers what the evidence means for Australian obstetric counseling, neonatal planning, and postnatal neurosurgical follow-up.

Evolution of prenatal myelomeningocele repair in Asia

Asian fetal surgery programs grew rapidly after the 2011 MOMS trial publication, although early adopters in Tokyo and Seoul had begun experimental work several years earlier. The first successful fetoscopic repairs in the region were reported by Japanese groups using a two-port technique with mini-laparotomy, while Korean teams advanced percutaneous fetoscopy under carbon dioxide insufflation. Each program adapted protocols to local case volumes, staffing models, and hospital reimbursement frameworks, producing useful natural experiments that complement the more uniform pathways seen in North American and European centers.

Patient selection generally mirrors international criteria: isolated myelomeningocele between S1 and T1, evidence of hindbrain herniation, gestational age under 26 weeks, and no severe maternal contraindications. However, Asian cohorts have included a higher proportion of fetuses with thoracic-level lesions than typically reported elsewhere, reflecting case-mix differences. Programs in Singapore and Hong Kong have also developed specific protocols for twin pregnancies discordant for spina bifida, an area where guidance remains sparse globally.

Surgical techniques and perioperative protocols

Open mid-gestational hysterotomy remains the standard in most Asian centers, replicating the MOMS protocol with modifications for thinner abdominal walls and smaller uterine incisions favored by Japanese surgeons. Fetoscopic repair, in contrast, has gained traction in Seoul and Taipei, where minimally invasive teams argue that avoiding large uterine incisions may reduce risks of placental abruption and preterm premature rupture of membranes in subsequent pregnancies.

Perioperative care differs in instructive ways. Korean centers have published extensively on fetal oxygenation monitoring in high risk pregnancies using near-infrared spectroscopy and Doppler indices, which they integrate into intraoperative decision-making. Singaporean teams have emphasized magnesium sulfate neuroprotection and aggressive tocolysis, while Chinese programs have adopted enhanced recovery after surgery protocols adapted from adult surgical practice. These variations provide clinicians with a portfolio of approaches to discuss with families.

Maternal anesthetic management follows standard balanced techniques with volatile agents and epidural analgesia, though Japanese anesthesiologists have reported on the use of remimazolam infusions to reduce neonatal exposure. Postoperative monitoring includes twice-daily ultrasound assessments, weekly MRI when feasible, and structured neurodevelopmental testing beginning at six months corrected age. This longitudinal follow-up is one of the strongest contributions of Asian programs, where the same surgical and developmental teams often follow children into school age.

Reported outcomes from Asian cohorts

Across published series, fetal surgery reduces the need for ventriculoperitoneal shunting by approximately 40 to 60 percent compared with historical postnatal cohorts, mirroring MOMS findings. Hindbrain herniation reversal is documented in 70 to 80 percent of cases treated before 24 weeks, with Japanese centers reporting the highest reversal rates, possibly because of earlier intervention. Motor function outcomes, assessed using functional imaging and standardized scales, suggest that two or more levels of functional improvement occur in roughly half of treated children.

Maternal morbidity remains the trade-off. Open repair carries uterine dehiscence risk in future pregnancies of around 10 percent, with classical cesarean section required in all subsequent deliveries. Fetoscopic approaches report lower dehiscence rates but higher rates of preterm prelabor rupture of membranes, often before 32 weeks. Korean data indicate a mean delivery gestational age of 33.4 weeks after open repair and 34.1 weeks after fetoscopic repair, with both groups showing acceptable neonatal survival above 95 percent.

Comparing Asian outcomes with the original MOMS cohort reveals important patterns. Asian cohorts tend to have slightly higher preterm birth rates but lower surgical site infection rates, the latter credited to lower average body mass indices and structured infection-prevention bundles. Long-term bladder and bowel continence data from Taiwanese centers, where urodynamic follow-up is routine, suggest that prenatal repair does not eliminate neurogenic bladder risk but may reduce severity, guiding counseling for families in Brisbane and Adelaide preparing for ongoing pediatric urology input.

Comparison of outcomes across surgical approaches

The choice between open hysterotomy and fetoscopic repair involves trade-offs that Australian obstetricians discuss with families during prenatal counseling, often over several appointments at tertiary centers in Melbourne or Sydney. Open repair offers established efficacy and shorter learning periods for emerging programs, while fetoscopic repair appeals to mothers concerned about future fertility and delivery mode. Below is a summary of key outcome metrics drawn from published Asian series.

These figures should be interpreted with caution. Asian series include selected low-risk cases, and few have matched cohorts treated at the same institution. Counseling therefore emphasizes individual maternal factors, fetal lesion level, and the expertise of the receiving center rather than any single summary statistic.

Implications for Australian practice families

Most Australian parents of a fetus with spina bifida access prenatal diagnosis between 18 and 22 weeks, often after the mid-trimester morphology scan offered routinely through Medicare-funded services. Discussion of fetal surgery options occurs in tertiary fetal medicine units in Brisbane, Sydney, Melbourne, or Perth, where multidisciplinary teams include maternal-fetal medicine specialists, neonatologists, pediatric neurosurgeons, and genetic counselors. Private health insurance rebates vary significantly, and the Medicare Benefits Schedule does not list a specific item for open fetal surgery, so out-of-pocket costs remain substantial for those treated domestically or abroad.

When families consider overseas treatment, RANZCOG recommends that Australian clinicians coordinate detailed documentation of imaging, surgical notes, and postoperative plans to ensure smooth transition back to local neonatal and rehabilitation services. Parents considering travel should also weigh details of maternal cholestasis of pregnancy diagnosis and fetal risks and other pregnancy-specific complications that may influence timing and logistics.

Postnatal care coordination is equally important. Children who have undergone prenatal repair require lifelong neurosurgical surveillance, orthopedic assessment for clubfoot and scoliosis, and access to continence management programs. Australian pediatric services provide strong multidisciplinary follow-up, but rural families in Queensland, Western Australia, and the Northern Territory may need to relocate temporarily for delivery and initial neurosurgical care.

Counseling, informed decision-making, and future directions

Effective counseling integrates objective outcome data with attention to family values, financial circumstances, and access to long-term pediatric services. Discussion of fetal movements and maternal perception becomes relevant in the postoperative period, when reduced fetal activity may signal complications requiring urgent evaluation. Many Asian programs now offer structured decision aids that Australian teams could adapt for local use, particularly for culturally diverse populations where decision-making preferences differ.

Research priorities in the region include refining fetoscopic instruments, developing biomaterial patches that integrate with fetal skin, and exploring stem cell adjuncts to enhance neural protection. Australian collaboration with Asian centers through the Federation of Asian and Oceania Perinatal Societies and affiliated research networks offers opportunities for joint outcome registries, particularly given the smaller Australian case volumes. Such registries would help define which fetuses benefit most from prenatal repair and which can be safely observed, refining the counseling conversation for the next generation of Australian families facing this diagnosis.

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