Results Themost common neoplasms were ependymo-ma and medulloblastoma and astrocytoma in the forth ventrie.Some tumors had specific patient s age.

• 结果第四脑室肿瘤以室管膜瘤、髓母细胞瘤、室管膜瘤和星形细胞瘤多见,肿瘤类型与其起源、发病年龄、信号特征关系密切。