Ependymomas arise from the ependymal cells that line the ventricles of the brain and the center of the spinal cord. They are soft, grayish, or red tumors which may contain cysts or mineral calcifications.
These tumors are divided into four major types:
- Subependymomas (grade I):Typically slow-growing tumors.
- Myxopapillary ependymomas (grade I):Typically slow-growing tumors.
- Ependymomas (grade II):The most common of the ependymal tumors. This type can be further divided into the following subtypes, including cellular ependymomas, papillary ependymomas, clear cell ependymomas, and tancytic ependymomas.
- Anaplastic ependymomas (grade III):Typically faster-growing tumors.