What Is Brain Stem Glioma?
A glioma is a type of tumor that occurs when cells in the glia, the supportive tissue of the brain, grow out of control. The glia helps keep neurons in place and functioning properly. Brain stem glioma usually refers to gliomas located in the brainstem.
There are three types of glial cells that can produce tumors:
- Ependymal cells
- Mixed gliomas display a mixture of these cells
Most brain stem gliomas tend to be astrocytomas, which can act differently depending on the part of the brainstem in which they occur. Gliomas that develop in the midbrain and medulla (the top and bottom segments of the brainstem) are usually low grade (grade I) tumors while those that occur in the pons (the mid-portion of the brainstem) are usually high grade (grade IV) tumors that grow much faster and progress more rapidly.
Brain stem gliomas usually occur in children, accounting for 11% of primary brain tumors in children and adolescents.
What Are Symptoms of Brain Stem Glioma?
Symptoms of brain stem glioma can develop quickly, over the course of days or weeks because the tumors grow so rapidly. Normal brainstem function can be affected and can result in symptoms such as:
What Causes Brain Stem Glioma?
The cause of brain stem glioma is unknown.
A risk factor for developing brain stem glioma includes a rare genetic condition called neurofibromatosis type 1 (NF1).
How Is Brain Stem Glioma Diagnosed?
Brain stem glioma is diagnosed with a physical exam and patient history. Other exams and tests used to diagnose brain stem glioma include:
What Is the Treatment for Brain Stem Glioma?
Treatments for brain stem gliomas include one or more of the following:
- Grade I brain stem gliomas are usually treated with surgery, or surgery plus radiation therapy
- If the tumor can be completely removed, brain stem glioma may be cured at this stage in some cases
- However, most of the time, brain stem gliomas are grade II-IV and grow rapidly, and they cannot be cured. The rapid growth of these tumors can impact critical brainstem functions and often surgery to remove the tumor is not possible.
- Radiation therapy
- The most effective and most common first-line treatment
- May also be combined with chemotherapy
- Usually used to treat tumor re-growth, either using standard agents or experimental drugs
- Participation in a clinical research study that includes new experimental drugs may be suggested
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