中枢神经系统肠源性囊肿的MRI表现

MRI findings of neurenteric cyst in central nervous system

目的:探讨中枢神经系统肠源性囊肿的MRI表现。方法:搜集经手术及病理最终确诊的23例肠源性囊肿患者并分析其MRI表现,所有患者均经MRI平扫,其中10例行MRI增强扫描,4例行DWI扫描。结果:23例肠源性囊肿患者中,3例发生在颅内,其中2例发生在左侧中颅窝,1例发生在桥前池,其余20例发生在椎管并且全部位于髓外硬膜下,其中颈段10例,胸段8例,腰段2例。MRI平扫大部分病灶T1WI呈等低信号,T2WI呈高信号,部分病灶信号混杂;9例增强扫描囊液及囊壁均未见明确强化,1例见边缘强化;部分病例可见特征性"脊髓嵌入征"表现;DWI均未见明显扩散受限;2例伴脊椎发育异常。结论:肠源性囊肿的形态及MRI信号特点具有一定特征,结合临床症状、伴发体征有助于早期诊断。

Objective：To study the MRI features of neurenteric cyst in central nervous system. Methods：MRI materials of 23 patients with neurenteric cyst proved by surgery and pathology were collected,the MRI manifestations were analysed retrospectively. All patients underwent plain scan of MRI, ten underwent enhanced MRI, and 4 had DWI. Results.. Of all 23 patients with neurenteric cysts,lesions showed intracranial location in 3 patients, one of which in left middle cranial fossa,the other two in prepontile cistern. The rest 20 patients had lesions located within intradural extramedullary space of intraspinal tube,including 10 situated in cervical segment, 8 in thoracic segment, and 2 in lumbar segment. Most of the lesions presented as isointensity or slight hypointensity on T1 WI, hyperintensity on T2 WI, some with mixed signals. 9 of all 10 patients who underwent enhanced MRI showed no enhancement in cystic wall or intra-cystic fluid,while one patient showed slight enhancement at the rim. Some patients showed the feature of spinal cord impaction. DWI didn＇t show any restricted diffusion. 2 patients had associated spine malformation. Conclusion： MRI manifestations of neurenteric cyst showed some characteristic features,early diagnosis could be made when MRI findings in combination with clinical symptoms and signs.