Glioma Causes

Written by Jiang Fang Shuai
Neurosurgery
Updated on September 02, 2024
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Gliomas are common intracranial primary tumors, with astrocytoma being the most prevalent, followed by oligodendroglioma, medulloblastoma, glioblastoma, ependymoma, etc. The causes of gliomas are very complex and are still unclear to this day. The prevailing view is that the development of gliomas results from the combined effects of internal carcinogenic genes and external carcinogenic factors. Changes in carcinogenic genes include gene mutation deletions, proto-oncogene activation, and so on. External factors mainly include radiation from X-rays, smoking, drinking, and some toxic and harmful foods and medications, etc.

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Is glioma malignant?

Glioblastoma is a type of malignant tumor, which generally grows at a fast pace. In the early stages of the disease, the glioma often adheres to the surrounding tissues, posing significant challenges for future complete surgical removal. At the same time, extensive cerebral edema occurs around the glioma. If prolonged, this can lead to a serious increase in intracranial pressure, manifesting as repeated headaches, dizziness, nausea, and vomiting in the patient. Over time, this condition may also lead to optic nerve atrophy, resulting in decreased vision and visual field defects. Diagnosis generally benefits from cranial CT or MRI scans, but definitive diagnosis still requires surgical removal of the tumor. A small amount of tumor tissue is typically retained for pathological biopsy.

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Is a glioma benign or malignant?

Glioblastoma is the most common form of malignant tumor inside the skull, and the vast majority of glioblastomas are highly malignant. Once changes in this condition are detected, generally, the patient doesn't have much time left. If it is a relatively better glioblastoma, which means it is highly differentiated, the survival time is about 1-2 years. For some poorer glioblastomas, or those with low differentiation, their survival period is often only about six months, and they continuously spread along with nerve fibers to the surrounding areas. They might even metastasize to distant places through cerebrospinal fluid, blood, lymph, and other means. Therefore, even if surgery is used to remove a single lesion, other parts of the body may still demonstrate metastatic lesions. Hence, the treatment approach for this is comprehensive.

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Can gliomas be inherited?

Gliomas have a certain hereditary proportion, but this is not an absolute concept. In clinical practice, there is no clear explanation for the pathogenic factors of gliomas, and theories are generally speculative. For instance, one factor is genetic nature, and there is also some familial clustering which supports the idea of a genetic predisposition. However, it is usually easier to identify purely genetic diseases, but gliomas often involve the inheritance of multiple genes, making it difficult to pinpoint the fundamental factors directly. Additionally, other factors include exposure to radiation and engaging in harmful work, such as producing methanol or solvents, etc. These can also cause genetic mutations leading to gliomas, so the issue is not necessarily solely genetic.

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Early symptoms of glioma

For patients with glioma, in the early stages of the disease, symptoms often manifest as mild headaches, dizziness, nausea, and vomiting. The symptoms are usually mild and tolerable for patients, and most patients do not pay enough attention, which can easily lead to missed and misdiagnosis. However, as the tumor volume increases, the patient's symptoms of headache, dizziness, and other discomforts gradually worsen, and may even show episodic outbreaks and a persistent worsening state. In addition to headaches and dizziness, some patients also exhibit significant motor dysfunction, exhibiting symptoms such as hemiplegia and aphasia. Patients with severe conditions may even experience widespread intracranial pressure increase, and life-threatening conditions due to the induction of brain herniation.

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Is glioma a terminal illness?

Glioblastoma is not an incurable disease. Patients with glioblastoma have a type of malignant tumor that tends to grow rapidly. These tumors often adhere to surrounding brain tissue in the early stages, making complete surgical removal difficult. If any glioma cells remain after surgery, the tumor tissue will gradually grow over time. Thus, patients with glioblastoma are prone to recurrence, but it is not an incurable disease. If early detection and surgical removal can be achieved, and supplemented by radiotherapy and chemotherapy, it can maximize the therapeutic effects of the surgery, thereby effectively improving the prognosis and delaying the progression of the disease. This approach can relatively extend the patient's lifespan, and some patients may even achieve long-term survival.