Abstract
Ependymomas are a group of glial tumors derived from the ependymal cells lining the ventricular surface. They arise most often from the walls of the fourth ventricle in the posterior fossa. Such tumors represent about 6 to 12% of all brain tumors, 25% of marrow tumors and 8% of pediatric brain tumors and represent third childhood malignant tumor. Ependymomas are usually slow-growing tumor…