小脑幕切迹下疝的CT诊断

目的 确定小脑幕切迹下疝的CT表现。方法 回顾性分析经临床证实的68例小脑幕切迹下疝的CT表现。结果 CT显示因脑组织移位及中脑本身受压移位导致单侧或双侧鞍上池改变60例、脚间池改变56例、环池改变52例、四叠体池改变50例。多数为前疝和半环疝。均有脑干的移位、旋转及变形改变，可伴有四脑室的变窄、闭塞及幕上占位病变的一系列改变。结论 参考原发病变的占位程度，脑干与脑干周围脑池两CT改变均存在并结合起来分析，可作出正确诊断。

CT diagnosis of the hernia under cerebellar tentorial incisure

Objective To determine CT findings of the hernia under cerebellar tentorial incisure (CTI).Methods CT findings in 68 patients with clinically proven the hernia under CTI were analyzed retrospectively.Results CT scan shown that because brain tissue's shift and midbrain pressure in itself or shift resulted in some brain cistern's change,of them,changes of unilateral or bilateral suprasellar cisterns were found in 60,interpeduncular cistern in 56,ambient cistern in 52 and quadrigeminal cistern in 50 cases.These changes were mostly anterior hernia and hemicyclic hernia.The changes of brain stem such as displacement,turning and deformity were frequently complicated with fourth ventricle 's narrowing and/or supratentorial occuping lesions etc.Conclusion Refering to the occuping extent of the primary lesions,overall analysis of CT findings on brain stem and its peripheral brain cistern can make a correct diagnosis.