1. Ellison D , Love S , Chimelli L , Harding BN , Lowe J , Vinters HV , et al . Neuropathology. 3rd edn. Edinburgh: Elsevier Ltd, 2013.
2. Supratentorial extraventricular ependymal neoplasms
3. Extraspinal ependymoma
4. Extraspinal ependymomas
5. Three gliomata of ependymal origin: two in the fourth ventricle, one subcutaneous over the coccyx;Mallory;J Med Res,1902