Arachnoid cyst overview: Difference between revisions

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Revision as of 18:20, 26 June 2020

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Arachnoid cysts are cerebrospinal fluid cysts covered by arachnoidal cells and collagen. They develop between the arachnoid membrane and the surface of the brain. Arachnoid cysts are mostly a congenital disorder.

Classification

Arachnoid cysts may be classified according to cause into 2 subtypes/groups: primary or secondary, or according to symptoms into 3 groups.

Causes

The exact cause of arachnoid cysts is not known. Researchers believe that most cases of arachnoid cysts are developmental malformations that arise from the unexplained splitting or tearing of the arachnoid membrane, being classified as primary. There are also arachnoid cysts that arise from secondary causes, such as trauma, surgery, intracranial hemorrhage and infection.

Epidemiology

Arachnoid cysts occur in about 1.2% of the general population and are more frequently seen in men than in women.

Natural History, Complications and Prognosis

Prognosis of arachnoid cyst is generally excellent and is usually associated with a benign disease course, despite being symptomatic in a few patients. Most are found incidentally, and a few may, rarely, enlarge and complicate with the symptoms previously described such as hydrocephalus, seizures, hearing loss, visual changes and cervical myelopathy.

History and Symptoms

References

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 ==Overview==
-'''Arachnoid cysts''' are [[cerebrospinal fluid]] cysts covered by arachnoidal cells and [[collagen]]<ref name="pn">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)</ref> that may develop between the surface of the [[human brain|brain]] and the cranial base or on the [[arachnoid membrane]], one of the three membranes that cover the brain and the [[spinal cord]].<ref name="ninds">http://www.ninds.nih.gov/disorders/arachnoid_cysts/arachnoid_cysts.htm [[NINDS]] Arachnoid Cysts Information Page</ref>  Arachnoid cysts are a [[congenital disorder]],<ref>Gelabert-Gonzalez M. "Intracranial arachnoid cysts", ''Rev Neurol.'', 2004 Dec 16-31;39(12):1161-6. (PMID 15625636)</ref> and most cases begin during infancy; however, onset may be delayed until adolescence.<ref name="ninds" />
+'''Arachnoid cysts''' are [[cerebrospinal fluid]] cysts covered by arachnoidal cells and [[collagen]]. They develop between the [[arachnoid membrane]] and the surface of the [[brain]].  Arachnoid cysts are mostly a [[congenital disorder]].
 == Classification ==