Intraspinal meningioma in a four-month-old infant.

Failure of an orderly separation of the neuroectoderm from the surface ectoderm with the interposition of mesoderm (dysjunction) results in a spectrum of defects involving the skin, spinal cord, as well as the intervening mesodermal structures. Errors in dysjunction manifest as a variety of spinal dysraphic states including dermal sinus tracts (DSTs) and CITs.[4] Spinal dysraphism is seen in 2-4/1000 live births. Spinal DSTs have an incidence of 1 in 2500 live births and are common in the lumbosacral region.[5] CITs such as epidermoids, dermoids, and teratomas form along the DSTs till the spinal cord or within it.