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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.[3] 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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| {{SIB}}
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| [[Category:Oncology]]
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