Medulla blastomas, highly invasive and rapidly growing, are also most commonly seen in children. They notoriously tend to seed in the ventricles and spinal subarachnoid space and are highly susceptible to radiation. Ependymomas, vascular malformations, and hemangeoblastomas involve the cerebellum, and the last is sometimes hereditary. Fifty percent of dysembryomas, while uncommon intracranialIy, are found in the cerebellum. Tumors arising outside the cerebellar parenchyma may involve it.
Examples are meningiomas of the posterior fossa and swannomas of the acoustic nerve.
If large, they may involve the cerebellum or its pathways and result in cerebellar signs and symptoms.