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髓母细胞瘤是儿童最常见的恶性肿瘤之一，大约占全部儿童颅内肿瘤的２０％～２５％［１］，多位于小脑蚓部，常侵犯四脑室及脑干，可沿脑脊液播散，在中枢神经系统内转移。其治疗以手术切除为主，术后辅以全中枢神经系统放疗，特殊病例结合化疗等综合疗法，５年生存率已达６０
Medulloblastoma is one of the most common malignant tumors in children, accounting for about 20% to 25% of all children’s intracranial tumors [1]. It is located in the cerebellar vermis and often invades the fourth ventricle and brainstem. It can be seen along the cerebrospinal fluid. Scattered and transferred within the central nervous system. The main treatment is surgical resection, supplemented by central nervous system radiotherapy after surgery, combined with special treatment combined with chemotherapy and other comprehensive therapies, the 5-year survival rate has reached 60