Posterior fossa astrocytoma
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Posterior fossa astrocytomas, those arising either from the cerebellum or from the brainstem are most frequently seen in children. Approximately 60% of all pediatric astrocytomas are found in the posterior fossa (20% brainstem, 40% cerebellum).
Many types of astrocytoma are found in the posterior fossa of children, however, two make up the majority of cases:
In adults, high-grade astrocytomas with piloid features are also encountered.