Approximately half of pediatric central nervous system tumors are located in the posterior fossa.
Pilocytic astrocytomas (PAs), medulloblastomas (MBs), and ependymomas are the most common posterior fossa tumors.
High-grade gliomas, atypical teratoid/rhabdoid tumor, and choroid plexus papilloma of the fourth ventricle are less frequent.
Because of the different treatment options and variability in long-term outcome, an accurate and specific diagnosis is mandatory 1).
Posterior fossa tumors tend to entail obstructive hydrocephalus, and urges initiating prompt treatment.