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  2. Meningioma - Wikipedia

    en.wikipedia.org/wiki/Meningioma

    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.

  3. Optic nerve sheath meningioma - Wikipedia

    en.wikipedia.org/wiki/Optic_nerve_sheath_meningioma

    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.

  4. Fibrillary astrocytoma - Wikipedia

    en.wikipedia.org/wiki/Fibrillary_astrocytoma

    These tentacles intermingle with healthy brain cells, making complete surgical removal difficult. However, they are low-grade tumors, with a slow rate of growth, so patients commonly survive longer than those with otherwise similar types of brain tumours, such as glioblastoma multiforme. [1]

  5. Pilocytic astrocytoma - Wikipedia

    en.wikipedia.org/wiki/Pilocytic_astrocytoma

    Pilocytic astrocytoma (and its variant pilomyxoid astrocytoma) is a brain tumor that occurs most commonly in children and young adults (in the first 20 years of life). They usually arise in the cerebellum, near the brainstem, in the hypothalamic region, or the optic chiasm, but they may occur in any area where astrocytes are present, including the cerebral hemispheres and the spinal cord.

  6. Sphenoid wing meningioma - Wikipedia

    en.wikipedia.org/wiki/Sphenoid_wing_meningioma

    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 ...

  7. Neuro-oncology - Wikipedia

    en.wikipedia.org/wiki/Neuro-oncology

    The rapid growth of fast-growing high-grade brain tumors may damage the subcortical network essential for electrical transmission, whereas slow-growing tumors have been suggested to induce partial deafferentation of cortical regions, causing denervation hypersensitivity and producing an epileptogenic milieu.