患者男，１０岁。头晕４～５个月，近１周头痛、呕吐并步态不稳就诊。身体发育正常，血常规及其他生化指标正常，神经系统有轻度共济运动失调。ＣＴ平扫：小脑蚓部区域团块状混杂密度影，形态不规则，边界不清，四脑室及环池明显受压变狭窄，四脑室前移。增强后，病灶明显... Patient male, 10 years old. Dizziness 4 to 5 months, nearly 1 week headache, vomiting and unsteady gait treatment. Physical development is normal, blood and other biochemical indicators of normal, mild nervous system disorders with ataxia. CT scan: cerebellar vermis clumps lumps mixed density, irregular shape, the boundary is unclear, the four ventricle and the Central pool significantly pressure change stenosis, four ventricle forward. After the enhancement, the lesion is obviously ...