meningocele

noun

me·​nin·​go·​cele

variants also meningocoele

me-ˈniŋ-gə-ˌsēl  mə-ˈnin-jə- 

: a protrusion of meninges through a defect in the skull or spinal column (as in spina bifida) forming a cyst filled with cerebrospinal fluid