A<unk>  is a type of<unk>  that presents and affects part of the central<unk>  system (CNS). They are usually benign and filled with either cerebrospinal fluid, blood, or tumor cells. CNS<unk> s are classified into two categories:<unk> s that originate from non-central<unk>  system tissue, migrate to, and form on a portion of the CNS, and<unk> s that originate within central<unk>  system tissue itself. Within these two categories, there are many types of CNS<unk> s that have been identified from previous studies.
Central nervous system cyst
Glial tumor
Chiari malformation
Brain metastasis
Choroid plexus tumor
Brain stem tumor
Primary central nervous system lymphoma
Central nervous system cavernous hemangioma