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arachnoid cyst
Arachnoid cysts are cerebrospinal fluid covered by arachnoidal cells and collagen〔Ariai S, Koerbel A, Bornemann A, Morgala M, Tatagiba M. "Cerebellopontine angle arachnoid cyst harbouring ectopic neuroglia", ''Pediatr Neurosurg.'' 2005 Jul-Aug;41(4):220-3. (PMID 16088260)〕 that may develop between the surface of the brain and the cranial base or on the arachnoid membrane, one of the three membranes that cover the brain and the spinal cord.〔http://www.ninds.nih.gov/disorders/arachnoid_cysts/arachnoid_cysts.htm NINDS Arachnoid Cysts Information Page〕 Arachnoid cysts are a congenital disorder,〔Gelabert-Gonzalez M. "Intracranial arachnoid cysts", ''Rev Neurol.'', 2004 Dec 16-31;39(12):1161-6. (PMID 15625636)〕 and most cases begin during infancy; however, onset may be delayed until adolescence.〔
==Classification==
Arachnoid cysts can be found on the brain or on the spine. Intracranial arachnoid cysts usually occur adjacent to the arachnoidal cistern.〔Arachnoid cyst. (n.d.). Gale Encyclopedia of Neurological Disorders. Retrieved September 10, 2006, from Answers.com Web site: http://www.answers.com/topic/arachnoid-cyst〕 Spinal arachnoid cysts may be extradural, intradural, or perineural and tend to present with signs and symptoms indicative of a radiculopathy.〔
Arachnoid cysts may also be classified as primary (congenital) or secondary (acquired) and have been reported in humans, cats, and dogs.〔Reed SD, Cho DY, Paulsen D. Quadrigeminal Arachnoid Cysts in a kitten and a dog. J Vet Diagn Invest 2009. 21(5):707-710.〕
Arachnoid cysts can be relatively asymptomatic or present with insidious symptoms; for this reason, diagnosis is often delayed.
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