Glioependymal cysts are congenital epithelial cysts of the neuraxis. They have a characteristic inner lining, which consists of glial and ependymal cells. They are developmental anomalies arising from inappropriate displacement and heterotopia (ectopic gray matter) of ventricular epithelium during neuronal migration.
Ceylon Medical Journal Vol. 53, No. 3, September 2008 pp.106-107