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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.
Leptomeningeal cancer is a rare complication of cancer in which the disease spreads from the original tumor site to the meninges surrounding the brain and spinal cord. [1] This leads to an inflammatory response, hence the alternative names neoplastic meningitis (NM), malignant meningitis , or carcinomatous meningitis .
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 ...
Cutaneous meningioma, also known as heterotopic meningeal tissue, and rudimentary meningocele [1] is a developmental defect, and results from the presence of meningocytes outside the calvarium. [ 2 ] : 622
The meninges lie between the skull and brain matter. Tumors originating from the meninges are meningiomas. Human brains are surrounded by a system of connective tissue membranes called meninges that separate the brain from the skull. This three-layered covering is composed of (from the outside in) the dura mater, arachnoid mater, and pia mater.
A nervous system tumor is a tumor that arises within the nervous system, either the central nervous system (CNS) or the peripheral nervous system (PNS). [1] [2] Nervous system primary tumors include various types of brain tumor and spinal tumors, such as gliomas, and meningiomas (of the CNS), and schwannomas (of the PNS) and can be either benign or malignant.
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 ...
A meningeal melanocytoma is a rare, pigmented tumor found on the leptomeninges of the brain, [6] [7] typically in the area of the base of the brain and brainstem, [2] or the spine. [4] [11] Symptoms may be absent or related to the tumor's growth and location. Similar to optic melanocytomas, the main concerns include growth, recurrence, and ...