Medulloblastoma is a type of cancerous brain tumor. It is the most common brain tumor in children. The tumor develops in the lower rear part of the brain called the cerebellum. The tumor is fast growing and can spread (malignant), however the cancer usually only spreads within the brain and spinal cord. Medulloblastomas are seen in children under age of 10, but the tumor can be found in adults, most often between the ages of 20-44 years. The exact cause of medulloblastoma is unknown, but mutations or changes in certain genes and chromosomes have been identified which may be involved. Although symptoms vary, common types of symptoms include headaches, vomiting, behavioral and appetite changes, and unusual eye movements. Treatment usually involves surgically removing the tumor, followed by radiation therapy. Chemotherapy may also be used in older children and adults. The prognosis (or outlook) for individuals with a medulloblasoma is looking better as treatments are improving. About 60% of the adults who underwent treatment live five years or more. Outcome for children is even better, reaching up to 80% survival after five years. However, survival rate for infants is poor, with only 50% five year survival rate. Talk with your doctors if you or your child has been diagnosed with a medulloblasoma to undrestand your options and decide on the best treatment plan. Support groups are also a good source of information and support.