Posterior fossa tumors are most common in children, which age group is most affected?

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Posterior fossa tumors show a strong pediatric pattern because the tumor types that most commonly arise in this region are those that originate in the developing brain. Medulloblastoma, pilocytic astrocytoma, and ependymoma frequently involve the cerebellum or the fourth ventricle in children, reflecting their growth patterns in a developing CNS. Medulloblastoma is the most common malignant CNS tumor in kids and characteristically centers in the cerebellar vermis; pilocytic astrocytoma is a common benign cerebellar tumor in children; ependymomas often arise around the fourth ventricle in the pediatric population, leading to hydrocephalus. Because these tumors are much more prevalent in children, the posterior fossa is overall more commonly affected in that age group than in adults, the elderly, or neonates.