Low-grade gliomas account for the majority of supratentorial tumors in children. Although some of these are in the sellar region (see above), most are located within the brain parenchyma and are of neuroepithelial origin. The majority of these tumors are low-grade astrocytomas, with the remainder being mixed gliomas,
oligodendrogliomas, gangliogliomas and a variety of other unusual tumor types. High-grade astrocytomas (WHO grade III and IV) can also occur in children, although far less frequently than in adults.
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