占位性小脑梗死的MRI诊断

MRI Diagnosis of the Space-occupying Cerebellar Infarction

探讨占位性小脑梗死的MR影像特征 ,提高诊断的准确性。材料和方法 :回顾分析11例临床确诊的小脑梗死病例 ,观察MRI图像上病灶的形态、范围、T1WI、T2WI信号特点和Gd -DTPA增强扫描时的强化特点。结果 :11例占位性小脑梗死均位于小脑后下动脉供血区 ,T1WI梗死区呈低信号 ,T2WI病灶呈明显高信号 ,其中8例发现“阶梯征” ,即T2WI上在高信号梗死区中见更高信号的脑沟影。结论 :“阶梯征”常出现于小脑梗死的急性后期 ,是诊断小脑梗死的可靠征象 ,认识此征象 。

Imaging feature of the space-occupying cerebellar infarction was discus sed to improve the confirmative diagnostic rate of this disease.Materials and Me thods:Eleven cases of the cerebellar infarction confirmed by clinic neurology we re reviewed.The shape?field? signal characters on MR T1 and T2 weighted image, and enhanced characters of the infraction area after injecting Gd-DTPA contrast were observed.Results:Eleven cases of the cerebellar infarctions lie in the are a supplied by posterior inferior cerebellar artery.The signals of the infarction area were lower on T1WI,and higher on T2WI.'Ladder sign' was found among 8 ca ses,i.e.higher signal sulcus was seen on the surface of the high signal infarcti on area.Conclusion:'Ladder sign' often occurs in the late stage of the acute c erebellar infarction.It is a reliable sign of the cerebellar infarction.To reali ze this sign will be helpful to distinguish tumors from the infarction.