An extra-parenchymal and intra-arachnoidal collection of fluid with a composition similar to that of cerebrospinal fluid. [ https://orcid.org/0009-0006-4530-3154 ]
Synonyms: Fluid-filled sac located in membrane surrounding brain or spinal cord
Term information
- SNOMEDCT_US:33595009
- UMLS:C0078981
Arachnoid cysts can be found on the brain, or on the spine. Intracranial arachnoid cysts usually occur adjacent to the arachnoidal cistern. Spinal arachnoid cysts may be extradural, intradural, or perineural.