髓母细胞瘤是颅内恶性肿瘤的一种,多发于儿童,儿童发病率约占小儿所有脑肿瘤的15%~20%,发病年龄75%为15岁以下。此肿瘤生长活跃,呈浸润性生长,且有沿脑脊液广泛播散、种植性转移的特点。常规的治疗是外科手术加全脑和脊髓放疗,但该肿瘤多生长于小脑蚓部或位于第四脑室顶部,部分 Medulloblastoma is a kind of intracranial malignant tumor that occurs frequently in children. The incidence of children accounts for about 15% to 20% of all brain tumors in children. The age of onset is 75% under 15 years of age. This tumor is actively growing, showing invasive growth, and along the cerebrospinal fluid spread widely, the characteristics of implantable metastasis. Conventional treatment is surgery plus whole brain and spinal cord radiotherapy, but the tumor mostly in the cerebellar vermis or in the top of the fourth ventricle, part of