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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.
Neuromas tend to be benign (i.e. not cancerous); many nerve tumors, including those that are commonly malignant, are nowadays referred to by other terms. Neuromas can arise from different types of nervous tissue, including the nerve fibers and their myelin sheath, as in the case of genuine neoplasms (growths) like ganglioneuromas and neurinomas.
In children aged 0–14 years, the most common brain tumors are pilocytic astrocytomas (17.5%), embryonal tumors (15.7%), and malignant gliomas (25.7%). [15] The overall incidence rate of brain tumors in children is 6.2 per 100,000. [9] The distribution and behavior of nervous system neoplasms differ significantly between adults and children.
Gangliogliomas are generally benign WHO grade I tumors; the presence of anaplastic changes in the glial component is considered to represent WHO grade III (anaplastic ganglioglioma). Criteria for WHO grade II have been suggested, but are not established. Malignant transformation of spinal ganglioglioma has been seen in only a select few cases ...
This is why brain tumors are far more common in elderly adults than younger ones and why people with immune system disorders are also most susceptable to developing brain tumors.
Schwannomas are relatively slow-growing. For reasons not yet understood, schwannomas are mostly benign and less than 1% become malignant, degenerating into a form of cancer known as neurofibrosarcoma. These masses are generally contained within a capsule, so surgical removal is often successful. [3]
The following year she was diagnosed with a benign acoustic neuroma - a non cancerous brain tumour. Karen, from Cheltenham, said: “I was getting really bad headaches and I kept getting told it ...
Ganglioneuroma (occasionally called a "ganglioma") is a rare and benign tumor of the autonomic nerve fibers arising from neural crest sympathogonia (undifferentiated cells of the sympathetic nervous system). [1] However, ganglioneuromas themselves are fully differentiated neuronal tumors that do not contain immature elements. [2]