**8. Diagnosis and differentials**

The Accurate diagnosis of pediatric tumors is essential to ensure balance between achieving a long-term cure and avoiding treatment related disability in survivors. The tentative diagnosis of medulloblastoma is relatively straight cut one from the age of the patient, history and neurological examination findings. Nonetheless, there are other maladies that are to be kept in mind. The two commonest differential diagnosis of a posterior fossa mass in children are pilocytic astrocytoma and ependymoma. Other lesions to be considered are atypical teratoid/rhabdoid tumors, exophytic brainstem glioma and choroid plexus papilloma as well as teratoma in infants and hemangioblastoma in patients with Von Hippel-Lindau syndrome. Metastasis is the first to be thought in adults as that is the most frequently encountered posterior fossa lesion [6, 10].
