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Meningioma, also known as meningeal tumor, is typically a slow-growing tumor that forms from the meninges, the membranous layers surrounding the brain and spinal cord. [1] Symptoms depend on the location and occur as a result of the tumor pressing on nearby tissue.
Malignant meningioma is a rare, fast-growing tumor that forms in one of the inner layers of the meninges (thin layers of tissue that cover and protect the brain and spinal cord). Malignant meningioma often spreads to other areas of the body. The World Health Organization classification system defines both grade II and grade III meningiomas as ...
All treatments for CNS tumors have significant risks and side-effects. In cases where tumors are slow growing and do not cause symptoms, it may be preferable to closely watch the patient's condition without any treatment, until new test results or symptoms indicate that the patient's condition has worsened. [17]
Tumors growing in the inner wing most often cause direct damage to the optic nerve leading especially to a decrease in visual acuity, progressive loss of color vision, defects in the field of vision (especially cecocentral), and an afferent pupillary defect. If the tumor continues to grow and push on the optic nerve, all vision will be lost in ...
Although benign tumors only grow in one area, they may still be life-threatening depending on their size and location. [9] Malignant glioblastomas usually have very poor outcomes, while benign meningiomas usually have good outcomes. [3] The average five-year survival rate for all (malignant) brain cancers in the United States is 33%. [4]
Optic nerve sheath meningiomas (ONSM) are rare benign tumors of the optic nerve. 60–70% of cases occur in middle age females, and is more common in older adults (mean age 44.7 years). It is also seen in children, but this is rare. The tumors grow from cells that surround the optic nerve, and as the tumor grows, it compresses the optic nerve.
Meningiomas, which develop in the meninges, are common primary brain tumors, representing approximately 37% of all brain tumors. [15] The incidence rate for meningiomas is 9.51 per 100,000 people. [9] Unlike gliomas, more than 98% of meningiomas are nonmalignant [15]. The 5-year survival rate for nonmalignant meningiomas is approximately 91%. [9]
[28] [29] Although benign tumors generally grow slowly, cases of fast-growing benign tumors have also been documented. [30] Some malignant tumors are mostly non-metastatic such as in the case of basal-cell carcinoma. [31] CT and chest radiography can be a useful diagnostic exam in visualizing a benign tumor and differentiating it from a ...