Spinal Extradural Arachnoid Cysts: Clinical, Radiological, and Surgical Feature

James K. Liu, M.D.; Chad D. Cole, M.D.; Peter Kan, M.D.; Meic H. Schmidt, M.D.

Disclosures

Neurosurg Focus. 2007;22(2) 

In This Article

Pathological Features

The wall of a spinal extradural arachnoid cyst usually consists of fibrous connective tissue with an inner single-cell arachnoid lining; however, this lining is sometimes absent on histological examination.[11,22] Spinal arachnoid cysts have been classified into three major categories:[16] extradural cysts without spinal nerve root fibers (Type I), subdivided into extradural arachnoid cysts (Type IA) and sacral meningoceles (Type IB); extradural cysts with spinal nerve root fibers (Type II); and intradural cysts (Type III). In some cases, an extradural cyst can demonstrate substantial intradural extension.[6,7] In nearly all cases of Type IA cysts, communication of CSF between the cyst and the intrathecal subarachnoid space through a dural defect has been reported.[4,6,14,16,19] The case of a noncommunicating spinal extradural arachnoid cyst was recently reported.[13] Intraoperatively, the dura was intact and there was no evidence of communication into the intradural subarachnoid space.

Comments

3090D553-9492-4563-8681-AD288FA52ACE
Comments on Medscape are moderated and should be professional in tone and on topic. You must declare any conflicts of interest related to your comments and responses. Please see our Commenting Guide for further information. We reserve the right to remove posts at our sole discretion.
Post as:

processing....