Is pilocytic astrocytoma a tumor of cerebellum?

Often: More often than not, these do occur in the lower portions of the brain.

In theory anywhere: In theory, it could happen anywhere in the brain, but most juvenile pilocytic astrocytomas are in the supratentorial brain (outside of the posterior fossa). Posterior fossa tumors are typically ependymoma, medulloblastoma in kids. Jpa's don't happen in adults (adults get lgg's, or who ii low grade gliomas..Just almost never who i tumors). Most stem lesions are not jpa's, but they happen too.