Definition: A glioma derived from relatively undifferentiated ependymal cells, comprising approximately 1–3% of all intracranial neoplasms; ependymomas occur in all age groups and may originate from the lining of any of the ventricles or, more commonly, from the central canal of the spinal cord; histologically, the neoplastic cells tend to be arranged radially about blood vessels, to which they are attached by means of fibrillary processes.
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Examples: glitazone, GI cocktail, etc.