1. Myxopapillary ependymoma with extensive sacral destruction: CT and MR findings;Moelleken;J Comput Assist Tomograph,1992
2. Myxopapillary ependymomas presenting in the soft tissue over the sacrococcygeal region;Anderson;Cancer,1966
3. Metastatic ependymoma of the sacrum;Miralbell;Cancer,1990
4. Primary tumors of the spinal cord and intradural filum terminale;Kernohan,1932
5. Three gliomata of ependymal origin: Two in the fourth ventricle, one subcutaneous over the coccyx;Mallory;J Med Res,1902