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spina bifida cystica
(spi´nә bif´ĭ-dә sis´tĭ-kә)
spina bifida in which there is protrusion through the defect of a cystic swelling that contains the meninges (meningocele) or the meninges and spinal cord (meningomyelocele).
Two types of spina bifida cystica shown in transverse section through the spinal column. (A), Meningocele, characterized by protrusion of the meninges; (B), a form of myelocele characterized by myeloschisis and protrusion of the defective spinal cord.

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