目的 探讨左侧小脑蛛网膜囊肿 的MRI表现，用以指导临床诊断及鉴别诊 断。方法 选取2009年9月至2011年9月的 100例左侧小脑蛛网膜囊肿患者，分别对 其进行常规MRI扫描以及增强扫描，并结 合常规核磁共振序列，分析左侧小脑蛛网 膜囊肿MRI表现并与手术结果对照。结果 100例检查者均采用MRI影像分析，常规扫 描确诊44例，增强扫描确诊48例，增强扫 描的确诊率高达96%，比常规扫描高。结 论 MRI在左侧小脑蛛网膜囊肿的鉴别与诊 断中具有非常高的应用价值，可以作为左 侧小脑蛛网膜囊肿术前的首选检查方法。

Objective To explore the MRI features of the left cerebellar cysts of the cerebellum, and to guide the clinical diagnosis and differential diagnosis. Methods In September 2009 to September 2011, 100 cases of arachnoid cyst of the left cerebellar patients, separately carries on the conventional MRI scanning and enhanced scanning, combined with conventional MRI sequences and analysis of left cerebellum arachnoid cyst MRI findings and the results were compared with surgery. Results 100 cases were examined by MRI image analysis, 44 cases were diagnosed by routine scan, 48 cases were confirmed by enhanced scan, the diagnosis rate of enhanced scan was as high as 96%, higher than that of conventional scanning. Conclusion MRI has very high application value in the diagnosis and differentiation of the left cerebellar cyst of the cerebellum. It can be used as the first choice for the diagnosis of the left cerebellar cyst.