In medicine, arachnoid cysts are "intracranial or spinal cavities containing a cerebrospinal-like fluid, the wall of which is composed of arachnoidal cells. They are most often developmental or related to trauma. Intracranial arachnoid cysts usually occur adjacent to arachnoidal cistern and may present with hydrocephalus; headache; seizures; and focal neurologic signs."
- Type I cysts are extradural without involving of nerve-root fibers
- Type II cysts, also called perineurial Tarlov cysts, are extradural and involve nerve-root fibers
- Type III cysts are intradural
Multiple arachnoid cysts may occur.
- Anonymous (2015), Arachnoid cyst (English). Medical Subject Headings. U.S. National Library of Medicine.
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- Brass SD, Dinkin MJ, Williams Z, Krishnamoorthy KS, Copen WA, Freeman SH (2009). "Case Records of the Massachusetts General Hospital. Case 38-2009 - a 16-year-old boy with paroxysmal headaches and visual changes.". N Engl J Med 361 (24): 2367-78. DOI:10.1056/NEJMcpc0905547. PMID 20007563. Research Blogging.
- Ergun T, Lakadamyali H (2009). "Multiple extradural spinal arachnoid cysts causing diffuse myelomalacia of the spinal cord.". Neurologist 15 (6): 347-50. DOI:10.1097/NRL.0b013e318194022e. PMID 19901717. Research Blogging.
- Online Mendelian Inheritance in Man, OMIM®. Johns Hopkins University, Baltimore, MD. MIM Number: 207790. World Wide Web URL: http://omim.org/.
- Online Mendelian Inheritance in Man, OMIM®. Johns Hopkins University, Baltimore, MD. MIM Number: 604213. World Wide Web URL: http://omim.org/.