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| {{Infobox_Disease |
| | #Redirect [[Brain tumor]] |
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| The WHO grading of CNS tumors establishes a malignancy scale based on histologic features of the tumor. The histologic grades are as follows:
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| *'''WHO grade I''' includes lesions with low proliferative potential, a frequently discrete nature, and the possibility of cure following surgical resection alone.
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| *'''WHO grade II''' includes lesions that are generally infiltrating and low in mitotic activity but recur. Some tumor types tend to progress to higher grades of malignancy.
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| *'''WHO grade III''' includes lesions with histologic evidence of malignancy, generally in the form of mitotic activity, clearly expressed infiltrative capabilities, and anaplasia.
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| *'''WHO grade IV''' includes lesions that are mitotically active, necrosis-prone, and generally associated with a rapid preoperative and postoperative evolution of disease.
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| === Neuroepithelial tumors.
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| ==== Glial tumors.
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| * Astrocytic tumors.
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| :* Pilocytic astrocytoma.
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| :* Diffuse astrocytoma (including fibrillary, protoplasmic, and gemistocytic).
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| :* Anaplastic astrocytoma.
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| :* Glioblastoma (including giant cell glioblastoma, and gliosarcoma).
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| :* Pleomorphic xanthoastrocytoma.
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| :* Subependymal giant cell astrocytoma.
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| * Oligodendroglial tumors.
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| :* Oligodendroglioma.
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| :* Anaplastic oligodendroglioma.
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| * Mixed gliomas.
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| :* Oligoastrocytoma.
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| :* Anaplastic oligoastrocytoma.
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| * Ependymal tumors.
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| :* Myxopapillary ependymoma.
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| :* Subependymoma.
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| :* Ependymoma (including cellular, papillary, clear cell, and tanycytic).
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| :* Anaplastic ependymoma.
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| * Neuroepithelial tumors of uncertain origin.
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| :* Astroblastoma.
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| :* Chordoid glioma of the third ventricle.
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| :* Gliomatosis cerebri.
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| ==== Neuronal and mixed neuronal-glial tumors (some glial component may be present).
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| * Gangliocytoma.
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| * Ganglioglioma.
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| * Desmoplastic infantile astrocytoma/ganglioglioma.
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| * Dysembryoplastic neuroepithelial tumor.
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| * Central neurocytoma.
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| * Cerebellar liponeurocytoma.
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| * Paraganglioma.
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| ==== Nonglial tumors.
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| * Embryonal tumors.
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| :* Ependymoblastoma.
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| :* Medulloblastoma.
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| :* Supratentorial primitive neuroectodermal tumor (PNET).
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| * Choroid plexus tumors.
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| :* Choroid plexus papilloma.
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| :* Choroid plexus carcinoma.
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| * Pineal parenchymal tumors.
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| :* Pineoblastoma.
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| :* Pineocytoma.
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| :* Pineal parenchymal tumor of intermediate differentiation.
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| === Meningeal tumors.
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| * Meningioma.
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| * Hemangiopericytoma.
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| * Melanocytic lesion.
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| === Germ cell tumors.
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| * Germinoma.
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| * Embryonal carcinoma.
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| * Yolk-sac tumor (endodermal-sinus tumor).
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| * Choriocarcinoma.
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| * Teratoma.
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| * Mixed germ cell tumor.
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| === Tumors of the sellar region.
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| * Pituitary adenoma.
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| * Pituitary carcinoma.
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| * Craniopharyngioma.
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| === Tumors of uncertain histogenesis.
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| * Capillary hemangioblastoma.
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| ===Primary CNS lymphoma.
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| ===Tumors of peripheral nerves that affect the CNS.
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| * Schwannoma.
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| ===Metastatic tumors.
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| {{SIB}}
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| [[Category:Oncology]] | |
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