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Talk to DoctorA low grade glioma is a slow-growing brain or spinal cord tumor that develops from the supportive glial cells in the central nervous system.
Overview
When exploring what a low grade glioma is, it helps to understand how it differs from other types of brain tumors. A low grade glioma (grade 1 or 2) grows much slower and generally presents with less severe symptoms compared to a fast-growing high grade glioma or an aggressive diffuse midline glioma. Furthermore, a low grade glioma is significantly more common in children, often standing as the most frequently diagnosed pediatric brain tumor, whereas adults experience them quite differently. Because a low grade glioma develops gradually from the brain’s supportive astrocyte, oligodendrocyte, or ependymal cells, patients often have a highly treatable outlook with an excellent chance of long-term survival, especially when caught early.
Symptoms
- Persistent headaches that may worsen in the morning or when coughing and straining.
- Frequent nausea and unexplained vomiting.
- Seizures or sudden dizzy spells.
- Loss of balance, clumsiness, or difficulty walking (abnormal gait).
- Vision problems, such as blurred vision, double vision, or loss of peripheral vision.
- Numbness or muscle weakness, often localized to one side of the body.
- Changes in behavior, personality, or cognitive decline (such as confusion or a gradual decline in schoolwork).
- Back pain or loss of bowel and bladder control (if the low grade glioma is located in the spinal cord).
Causes
- The exact cause of a low grade glioma remains largely unknown.
- They originate from specific genetic mutations within the glial cells that prompt abnormal, slow cell multiplication.
- Research indicates that specific genomic drivers and molecular changes contribute directly to the cellular development of a low grade glioma.
Risk factors
- Age: Being a child or young adult is a notable risk factor, as a low grade glioma represents roughly 40% of all childhood brain and spinal cord tumors.
- Genetic Conditions: Having certain inherited genetic disorders, most notably Neurofibromatosis type 1 (NF1), significantly increases the risk of developing a low grade glioma.
- Prior Radiation Exposure: Although less common as a direct cause for this specific tumor, previous radiation therapy to the head can generally increase the risk of developing brain tumors later in life.
Diagnosis
To accurately diagnose a low grade glioma, a multidisciplinary medical team will first review the patient’s medical history and perform comprehensive physical and neurological exams to assess brain function. From there, advanced imaging studies are crucial; a CT scan might be the initial step, but an MRI scan is the gold standard for viewing the size, position, and specific details of a low grade glioma. Depending on the tumor’s location, doctors may also order an electroencephalogram (EEG), a lumbar puncture, or a surgical biopsy to examine the tissue under a microscope, which officially confirms the low grade glioma diagnosis and helps stage the tumor.
Treatment
The treatment journey for a low grade glioma is highly personalized, depending heavily on the patient’s age, as well as the tumor’s exact type, size, and location within the central nervous system. Because a low grade glioma is generally slow-growing, the primary goal is often to safely remove as much of the mass as possible while preserving delicate neurological functions. Specialists utilize a combination of advanced therapies to not only treat the low grade glioma but also manage any associated complications or side effects.
Controlling symptoms
Before, during, and after treating the low grade glioma itself, managing the physical impact of the tumor is a top priority. Doctors often prescribe specialized medications, such as anti-seizure drugs to prevent convulsions or corticosteroids to reduce brain swelling and alleviate severe headaches. Effectively controlling these symptoms is an essential step that immediately improves the patient’s daily comfort and stabilizes their condition for further low grade glioma treatments.
Surgery
Only a few low grade gliomas are well-defined and can be detached from surrounding tissue. Current approach is called safe maximal resection; resect most part of the tumor while preserving critical functional areas of the brain. The aim is to remove as much tumor as possible without causing severe neurological deficit.
Radiation therapy
When a low grade glioma cannot be completely removed through surgery, or if the patient is an older child or adult, radiation therapy may be introduced. This treatment uses highly targeted, high-energy beams to destroy any remaining microscopic tumor cells in the specific area where the low grade glioma originated. By precisely directing the radiation, oncologists can effectively halt the growth of the low grade glioma while minimizing damage to the surrounding healthy brain tissue.
Chemotherapy
Chemotherapy utilizes powerful anti-cancer drugs to shrink or destroy low grade glioma cells and is frequently used alongside surgery or radiation. Typically administered intravenously or orally over a period of several months to a year, this systemic treatment is quite effective, especially for pediatric patients with a low grade glioma, as it can delay or sometimes entirely replace the need for radiation therapy. While it can cause side effects like nausea or temporary hair loss, modern supportive care makes chemotherapy for a low grade glioma highly manageable on an outpatient basis.
Targeted therapy
Also known as precision medicine, targeted therapy involves tailoring the treatment directly to the unique genetic characteristics of an individual’s low grade glioma. By identifying specific genomic drivers or genetic mutations that cause the low grade glioma to grow, doctors can use specialized drugs that attack only those faulty mechanisms, sparing healthy cells. This personalized approach represents the forefront of modern oncology, offering a highly effective and less toxic option for managing a low grade glioma.
Rehabilitation post treatment
The healthcare journey does not end once the primary therapies for a low grade glioma are complete; comprehensive post-treatment rehabilitation is vital for long-term well-being. Because a low grade glioma and its subsequent treatments can affect motor skills, vision, or cognitive abilities, patients often benefit greatly from physical therapy, occupational therapy, and specialized educational support. Through dedicated long-term follow-up clinics, medical teams continuously monitor the patient’s progress, ensuring they regain their strength, manage any late side effects, and return to a fulfilling life after a low grade glioma diagnosis.
