患者女,20岁。住院号A-00156。主诉:头痛、走路不稳已1年,近期症状加重,并出现复视。查体:双侧视乳头水肿,眼球有水平震颤,病理反射未引出。胸透、心电及常规实验室检查均正常。 CT扫描:小脑蚓部可见直径约4cm类圆形混杂密度灶,其内可见钙化。脑室系统中度扩张。增强扫描病灶未见异常强化(图1)。CT诊断:小脑蚓部占 Female patient, 20 years old. Hospital number A-00156. Chief complaint: headache, walking instability for 1 year, the recent symptoms worsened, and diplopia. Physical examination: bilateral papillae edema, eye level tremor, pathological reflex did not lead. Chest throat, ECG and routine laboratory tests were normal. CT scan: cerebellar vermis visible diameter of about 4cm class of circular hybrid densification, which can be seen calcification. Ventricular system moderate expansion. Enhanced scan lesions showed no abnormal enhancement (Figure 1). CT diagnosis: Cerebellar vermis accounted for