Prenatal Neurosurgical Counseling for Myelomeningocele and Treatment-Determining Factors for Fetal Repair.

Introduction: Spina bifida guidelines recommend neurosurgical involvement in prenatal counseling to inform decision-making between prenatal and postnatal myelomeningocele (MMC) repair. This study examines whether families with MMC presenting to one fetal center had timely neurosurgical prenatal counseling (nPNC) encounters and assesses modifiable and non-modifiable treatment-determining factors.

Methods: History and timing of nPNC were quantified among infants undergoing postnatal and prenatal MMC repair, pregnant patients referred, and MMC studies in a fetal MRI database (2015-2023). Fetal repair exclusions, presentation timing, social determinants, and reported rationale for not selecting offered fetal therapy were assessed.

Results: Nearly all patients (34/35; 97%) engaged in nPNC, 82% prior to 24 weeks GA. Fourteen patients were excluded from fetal repair for lack of hindbrain herniation (43%), obstetric exclusions (21%), fetal exclusions (21%), suspected closed defect (7%), and delayed presentation (7%). These patients ultimately underwent postnatal repair (71%), and pregnancy termination (14%). The 20 fetal-repair-eligible patients selected fetal repair (50%), postnatal repair (45%), and pregnancy termination (5%). Reasons for declining fetal repair included risk (55%) and cost (22%).

Conclusions: Among MMC families presenting to a regional fetal therapy center, nPNC was widely extended, in a mostly timely fashion. Very few were deterred from fetal repair by potentially modifiable barriers.