Neoplasms, Nerve Tissue
| Medical Definition: |
Neoplasms composed of nerve tissue. This concept does not refer to neoplasms located in the nervous system or its component nerves. |
| Guide Notes: |
neoplasms composed of nerve tissue, NOT neoplasms located in the nervous system or nerves ( = NERVOUS SYSTEM NEOPLASMS): TN 135; /blood supply /chem /second /secret /ultrastruct permitted; coord IM with precoord organ/neopl term (IM) |
Neoplasms, Nerve Tissue Categories.
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Meningioma - A relatively common neoplasm of the central nervous system that arises from arachnoidal cells. The majority are well differentiated vascular tumors which grow slowly and have a low potential to be invasive, although malignant subtypes occur. Meningiomas have a predilection to arise from the parasagittal region, cerebral convexity, sphenoidal ridge, olfactory groove, and spinal canal. They tend to present in the fourth to sixth decades of life with signs indicative of a slowly progressive mass lesion. Specific clinical manifestations depend on the location of the tumor, but may include INTRACRANIAL HYPERTENSION, cranial neuropathies, ataxia, and other focal neurologic signs. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2056-7) |
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Nerve Sheath Tumors - Tumors arising from nerve sheaths formed by SCHWANN CELLS in the peripheral nervous system and by oligodendrocytes in the central nervous system. Malignant peripheral nerve sheath tumors, NEUROFIBROMA, and NEURILEMMOMA are relatively common tumors in this category. |
Neoplasms, Nerve Tissue Medical Definitions and Terms
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