Unlike adults, majority of pediatric tumors are:

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In children, brain tumors are more likely to arise in the infratentorial (posterior fossa) region. This reflects the common pediatric tumor types, such as medulloblastoma, cerebellar astrocytoma, and ependymoma, which typically develop in the cerebellum and brainstem areas behind the tentorium. Because of this pattern, the majority of pediatric brain tumors present in the posterior fossa, leading to symptoms like balance problems, ataxia, and signs of increased intracranial pressure from hydrocephalus. In contrast, adults more often have tumors located in the supratentorial compartment. So the best understanding is that pediatric tumors predominantly involve the infratentorial region, rather than being clustered around the brain stem only or distributed equally across brain areas. If a source suggests supratentorial predominance in kids, it would be atypical relative to the standard pattern.