摘要
目的 提高对胼胝体非出血性挫伤的影像诊断水平。方法 回顾性分析 12例胼胝体非出血性挫伤的MRI资料。 11例为机动车车祸伤 ,1例为坠落伤。全部病例均进行了CT和MRI非增强检查 ,外伤至MRI检查的间隔时间 :8例为 1～ 3d、4例为 6～ 30d。结果 12例胼胝体挫伤灶中 ,3例位于压部 ,涉及干部为主者 9例。CT扫描胼胝体区未见异常密度。MRI上均表现为T1WI呈等或略低信号 ,T2 WI上呈明显高信号 ,未见出血信号。SE或快速自旋回波 (FSE)轴面或矢状面T2 WI对病变显示清楚 ,而液体衰减反转恢复序列 (fluid attenuatedinversionrecovery ,FLAIR)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MRI检查显示挫伤灶演变为类似脑脊液信号的软化灶。10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少见 ,CT检查难以发现 ,MRI是其最佳的影像学检查手段。
Objective To describe MRI findings of 12 cases of non hemorrhagic contusion of corpus callosum. Methods The MR images of 12 patients were reviewed retrospectively. 11 cases were victims of vehicle accident and 1 patient was injured by falling. All patients were examined with precontrast CT and MR imaging within 3 days (8 cases) and 6 to 30 days (4 case). Results The lesions were located at splenium (3 cases) and mainly at body (9 cases). There was no abnormal signs of corpus callosum on CT images. MR study in all 12 cases demonstrated isointense or slight hypointense signal compared with gray matter on T 1WI and obvious hyperintense signal lesions on T 2WI on corpus callosum. There was no hemorrhagic signal or density on MR and CT images at corpus callosum. These contusion lesions were demonstrated nicely on SE or FSE T 2WI images. On FLAIR sequence, these lesions were revealed more clearly for the signal of CSF was suppressed. MR follow up examination in one case four months later, the contusion lesion became malacia with the signal similar to that of CSF. Several other multiple contusion and hemorrhage lesions were detected in ten cases. Conclusion The non hemorrhagic contusion of corpus callosum is a relatively rare species. These lesions can′t be found on CT images, while MRI is the best tool for detecting them. SE or FSE T 2WI is the main sequence for demonstrating. These lesions could be seen more clearly on FLAIR sequence. The isointense or slight hypointense T 1WI signal and hyperintense T 2WI signal of corpus callosum after head injury is the typical MR imaging signs.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2000年第10期703-705,共3页
Chinese Journal of Radiology
关键词
脑
胼胝体
挫伤
磁共振成像
Brain
Corpus callosum
Contusion
Magnetic resonance imaging
