Meningiomas:

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Meningiomas:

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Meningiomas arise from the arachnoid layer of the meninges, which is the outermost layer that covers the brain and spinal cord. They are typically well-defined and encapsulated tumors that grow slowly and are usually benign. They are the most common primary brain tumor, accounting for approximately 30% of all brain tumors. They are not usually infiltrative, unlike other forms of brain tumors such as gliomas, which can infiltrate surrounding brain tissue. Meningiomas rarely arise from the pia mater, which is the innermost layer of the meninges.