Management of Unrepaired Myelomeningocele

Immediate Priorities

An unrepaired myelomeningocele requires urgent surgical closure to prevent central nervous system infection, with antibiotics initiated immediately if closure will be delayed beyond 48 hours 1, 2
Start prophylactic antibiotics immediately if surgical repair cannot be performed within 48 hours to reduce the risk of meningitis and ventriculitis 1, 2
The mortality rate for newborns with myelomeningocele is approximately 10%, with infection being a major contributor to morbidity and mortality 3

Early surgical repair (within the first few days of life) is the standard approach to minimize infection risk and preserve neurological function 1, 2
Historically, postnatal closure was performed to prevent central nervous system infection, and this remains the standard when prenatal repair was not performed 4, 5

Monitor carefully for development of tethered spinal cord, which causes deterioration in ambulatory function in both prenatal and postnatal repair patients 5, 6, 7
Spinal cord tethering or dermoid inclusion cysts are associated with neurological deterioration and loss of ambulation over time 4, 5, 6
Initial ambulatory status depends on the anatomic level of the neural tube defect 4, 5, 6

Do not delay antibiotic initiation if surgery cannot be performed within 48 hours – this is a Level III recommendation despite insufficient evidence for the 48-hour closure window itself 1, 2
Avoid assuming that larger ventricular size automatically requires immediate shunting – conservative management with close monitoring is appropriate for asymptomatic ventriculomegaly 3, 8

Hydrocephalus is the most frequent comorbidity, occurring in approximately 70-80% of patients with myelomeningocele, according to the American Association of Neurological Surgeons 9
Children with asymptomatic ventriculomegaly can be managed conservatively without immediate shunting, monitoring for progressive macrocephaly, signs of neurological dysfunction, and progressive ventricular enlargement, as recommended by the American Association of Neurological Surgeons 9
Consider endoscopic third ventriculostomy (ETV) with or without choroid plexus coagulation (CPC) as an alternative to shunting, which avoids shunt dependency despite often resulting in persistent ventricular enlargement, based on evidence from the American Association of Neurological Surgeons 9

Monitor carefully for tethered cord syndrome, which occurs in both prenatal and postnatal repair patients and causes deterioration in ambulatory function, as advised by the American Association of Neurological Surgeons 10
Prenatal closure may increase the risk of recurrent tethered cord over the baseline rate seen with postnatal closure, according to the American Association of Neurological Surgeons (Level II recommendation) 10
Tethered cord syndrome and dermoid inclusion cysts develop earlier in children who had in utero closure, as reported by the American Association of Neurological Surgeons 10