胼胝体非出血性挫伤的MRI诊断(附四例报告)

目的报告4例胼胝体非出血性挫伤的MRI表现。材料与方法回顾性分析4例胼胝体非出血性挫伤的MRI资料；3例为车祸伤，1例为坠落伤，都进行了CT和MR非增强检查。结果4例胼胝体挫伤灶2例位于压部、1例位于干部、1例累及胼胝体大部。CT扫描胼胝体区未见异常密度。MR图像上均表现为等或略低T1WI信号与明显高T2WI信号，未见出血信号。SE或FSET2WI(轴位或矢状位)对病变显示清楚，而FLAIR序列则能抑制脑脊液的高信号、使病变显示更加突出。1例4个月后MR检查显示挫伤灶演变为类似脑脊液信号的软化灶。4例中3例还合并颅内多处脑挫伤和血肿。结论胼胝体非出血性挫伤较少见，CT检查难以发现病灶MR是其最佳的影像学检查手段，轴位与矢状位SE或FSET2WI是显示挫伤灶的主要序列，FLAIR序列对病灶的显示更佳。本病典型的MRI表现是胼胝体区T1WI等或略低信号、T2WI高信号，无出血信号；胼胝体非出血性挫伤可合并颅内多发性外伤性改变。

MRI of Non hemorrhagic contusion of corpus callosum(report of 4 cases)

To describe MRI findings of 4 cases of non- hemorrhagic contusion of corpus callosum.Materials.and methods The MR imagings of 4 patients were reviewed retrospectively. 3cases were victims of vehicle accident. 1 patient was injuried by falling. All patients were examined with precontrast or and MR imaging. Results The lesions were located at splenium(2 cases) ac stem(1 cases) in three patients. The othe case, Corpus callosum was affected nearly completely. There was no abnormal signs of corpus callosum on their CT imag ings. MR study of all 4 me demonstrated isointense or slight hypointense signal with gray matter on T1 WI and obvious hyperintense signal le- sions on T2WI oncorpus callosum. There was no hemorrhagic signal of densith detected on MR and CT imagings at corpus callosum. These cont usion lesions were demonstrated nicely on SE or FSE T2WI imagings. On FLAIR sequence,these lesions were revealed more clearly or the signal of CSF was suppressed.On the MR examination of one case four months later, the contusion lesion become malacia which signal similar to that of CSF. Several other multiple contusion and hemorrhage lesions were detected in three cases. Conclusions The non - hemorrhagic contusion contusion of corpus callosum is a relatively rare species.These lessions can' t be found on CT imagings, while MRI is the ha tool of dtecting. SE or FSE T2WI is the main sequence for demonstrating. These lesions could be seen more clearly on FLAIR Sequence. The isointense or slight hypointense T1 WT signal and hyperintense T2WI signal of corpus callosum after head injury is the typical MR imaging signs.