Medulloblastoma
Medulloblastoma is a highly malignant primary brain tumor that originates in the cerebellum or posterior fossa.Tumors that originate in the cerebellum are referred to as infratentorial because they occur below the tentorium a thick membrane that separates the cerebral hemispheres of the brain from the cerebellum. Another term for medulloblastoma is infratentorial primitive neuroectodermal tumor (PNET).
