Myelomeningocele before birth

Area of Science:

• Developmental Biology
• Embryology
• Neuroscience

Background:

• Myeloschisis is a severe neural tube defect.
• Understanding its embryonic development is crucial for identifying causes of related congenital anomalies.

Purpose of the Study:

• To characterize embryonic myeloschisis and compare it with infantile spina bifida cystica.
• To elucidate the pathogenesis of myelomeningocele.

Main Methods:

• Study of 92 human embryos and four fetuses with myeloschisis.
• Comparative analysis of embryonic myeloschisis characteristics versus infantile spina bifida cystica.

Main Results:

• Embryonic myeloschisis lesions are often diffuse, affecting the whole spinal cord or cervical cord.
• Holoprosencephaly is frequently associated; meningocele is absent.
• Hydrocephalus and Arnold-Chiari malformation develop later, during the fetal period.

Conclusions:

• Myelomeningocele likely results from primary neural tube non-closure, not post-closure rupture.
• Neural overgrowth and disturbed recanalization are implicated in myelomeningocele pathogenesis.