text: The<unk>  of medulloblastoma is based on the modified Chang's<unk>  system. Medulloblastoma patients are risk stratified into either a standard risk group or a high risk group based on the tumor stage, the patient's age, and the extent of any previous surgical resection.
option_0: Medulloblastoma staging
option_1: Medulloblastoma classification
option_2: Craniopharyngioma classification
option_3: Ganglioneuroma staging
option_4: Retinoblastoma staging
option_5: Esthesioneuroblastoma staging
option_6: Neuroblastoma staging
option_7: Germinoma classification