“…2,3,6,11,13,14) The first surgical intervention was performed in 1944. 4,5,11,12,14) The description and pathogenesis of intrasacral extradural arachnoid cysts are still controversial, but the origin may be congenital. 2,3,5,6,11,13) However, the term meningocele is used to describe herniation of the meninx from a spina bifida or cranium bifidum defect, but the term intrasacral meningocele does not describe a true meningocele.…”