Arachnoid cysts are fluid filled sacs present in the brain or spinal cord between the brain tissue and Arachnoid layer covering the brain. Primary arachnoid cysts are present at birth and secondary arachnoid cysts develop due to infections, trauma or tumors in the brain. Symptoms vary depending on the size and location of the cyst. Typical symptoms include headaches, nausea, vomiting, dizziness, weakness. Treatment depends on the size and location of the cyst. A small cyst causing no significant symptoms may be observed with no intervention. A large cyst causing symptoms may need surgical treatment. There are endoscopic procedures or open procedures to treat arachnoid cysts.
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http://www.jultrasoundmed.org/content/29/10/1487.full.pdf. prenatal diagnosis of a suprasellar arachnoid cyst with 2- and 3-dimensional sonography and fetal magnetic resonance imaging difficulties in management and review of the literature ali gedikbasi, md, figen palabiyik, md, aylin oztarhan, md, gokhan yildirim, md, ciler eren, md, sezin saygi ozyurt, md, yavuz ceylan, md. j ultrasound med 2010; 29:1487–1493.
http://www.hindawi.com/journals/crira/2014/371969/. docampo jorge, gonzalez nadia, vazquez claudio, morales carlos, and gonzalez-toledo eduardo, “cystic meningioma simulating arachnoid cyst: report of an unusual case,” case reports in radiology, vol. 2014, article id 371969, 4 pages, 2014. doi:10.1155/2014/371969
http://www.casesjournal.com/content/2/1/7531. multiple extradural spinal arachnoid cysts: a case report and review of the literature. mohammad ali bitaraf, mehdi zeinalizadeh, ali tayebi meybodi*, keyvan tayebi meybodiand zohreh habibi. cases journal 2009, 2:7531