User Tools

Site Tools


Myelomeningocele (MMC)

Myelomeningocele, also known as open spina bifida, is the most severe form of spina bifida.


Myelomeningocele (MMC) is the most common neural tube defect.


see Myelomeningocele treatment.


see Myelomeningocele complications.

Late problems/issues

1. hydrocephalus: may mimic ≈ anything listed below. ALWAYS RULE OUT SHUNT MALFUNCTION when an MM patient deteriorates

2. syringomyelia (and/or syringobulbia)

3. Tethered cord syndrome as many as 70% of MM patients have a tethered cord radio- graphically (some quote 10–20%), but only a minority are symptomatic. Unfortunately, there is no good test to check for symptomatic retethering (SSEPs may deteriorate,15 myelography may help) a) scoliosis:early untethering of cord may improve scoliosis;

b) symptomatic tethering may manifest as delayed neurological deterioration

4. dermoid tumor at the MM site: incidence ≈ 16%

5. medullary compression at foramen magnum, see symptomatic Chiari II malformation

6. use of growth hormone to increase stature is controversial


It is a common birth defect that is associated with significant lifelong morbidity.

In myelomeningocele, the bones of the spine (vertebrae) don't form properly. This lets a small sac extend through an opening in the spine. The sac is covered with a membrane. It holds cerebrospinal fluid (CSF) and tissues that protect the spinal cord (meninges). The sac may also contain portions of the spinal cord and nerves. The sac itself may be opened up either before birth or during the birth.

Myelomeningocele results in significant life-long disabilities, impaired quality of life, and difficult medical management. The pathological progression of MMC involves failure in neural tube and vertebral arch closure at early gestational ages, followed by subsequent impairment in spinal cord and vertebral growth during fetal development. MMC is irreversible at term.

Patients with myelomeningocele have significantly lower health-related quality of life (HRQOL) scores than those with other spinal dysraphisms. History of shunt treatment and Chiari decompression correlate with lower health-related quality of life (HRQOL) scores 1).

Case series

see Myelomeningocele case series.

Rocque BG, Bishop ER, Scogin MA, Hopson BD, Arynchyna AA, Boddiford CJ, Shannon CN, Blount JP. Assessing health-related quality of life in children with spina bifida. J Neurosurg Pediatr. 2015 Feb;15(2):144-9. doi: 10.3171/2014.10.PEDS1441. Epub 2014 Nov 21. PubMed PMID: 25415252.
myelomeningocele.txt · Last modified: 2019/12/05 00:51 by administrador