What is Ependymoma?
Ependymoma is a type of tumor that forms from ependymal cells that line the ventricles (fluid-filled spaces in the brain) and the central canal of the spinal cord. Ependymomas can occur at any age but are more commonly diagnosed in children and young adults.
Ependymomas are classified based on their location within the CNS:
- Supratentorial Ependymomas: Found in the cerebral hemispheres.
- Infratentorial (Posterior Fossa) Ependymomas: Located in the cerebellum or brainstem.
- Spinal Ependymomas: Occur in the spinal cord.
They are also graded based on their histological characteristics:
- Grade I (Subependymoma): Typically, slow-growing and considered benign.
- Grade II (Ependymoma and Myxopapillary Ependymoma): Intermediate grade with varying prognosis.
- Grade III (Anaplastic Ependymoma): More aggressive and malignant.
Risk Factors
The exact causes of ependymoma are not well understood, but several risk factors may contribute to its development. These include:
- Genetic Conditions: Certain genetic syndromes, such as neurofibromatosis type 2 (NF2), can increase the risk of developing ependymomas.
- Age: Ependymomas can occur at any age but are most commonly diagnosed in young children and adults in their 30s and 40s.
- Radiation Exposure: Previous exposure to radiation therapy, particularly to the head, can increase the risk of developing brain tumors, including ependymomas.
- Gender: Some studies suggest that ependymomas may be slightly more common in males than females.
While these factors may increase the risk of developing ependymoma, having one or more risk factors does not mean that a person will develop the tumor. Conversely, ependymomas can occur in individuals with no known risk factors.