例１女，１０岁，头痛半年，加重伴右睑下垂，吞咽呛咳２５天。查；右眼完全性动眼神经受损，共济差，左侧轻度椎体束受损，临床怀疑脑干病变。ＣＴ平扫见右桥小脑角高密度不规则块影，大小约３．６ｃｍ×６．２ｃｍ，边缘清楚，中心有坏死囊变，向前上方生长，累及枕骨斜坡及 Example 1 Female, 10 years old, headache for six months, aggravated with right eyelid ptosis, swallowing cough for 25 days. Check; right eye complete oculomotor nerve damage, poor ataxia, left mild vertebral bundle damage, clinical suspicion of brain stem lesions. CT scan to see the right cerebellar horn high density irregular block, about the size of 3.6cm × 6.2cm, clear edge, the center of necrotic cysts, forward and upward growth, involving the occipital slope and