meningocele meningomyelocele

myelocystocele myelocele

Drawings of various forms of spinal dysraphic lesions (spina bifida cystica). A: Meningocele. Through the bony defect (spina bifida), the meninges herniate and form a cystic sac filled with spinal fluid. The spinal cord does not participate in the herniation and might or might not be abnormal. B: Myelomeningocele. The spinal cord is herniated into the sac and ends there or can continue in an abnormal way further downward. C: Myelocystocele or syringomyelocele. The spinal cord shows hydromyelia; the posterior wall of the spinal cord is attached to the ectoderm and is undifferentiated. D: Myelocele. The spinal cord is araphic; a cystic cavity is in front of the anterior wall of the spinal cord.


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