^1HMRS对高级别脑胶质瘤与孤立脑转移瘤的鉴别诊断价值

The value of ^1HMRS spectroscopy for the differential diagnosis of brain high-grade gliomas and solitary metastase

目的初步探讨氢质子磁共振波谱(1HMRS)在高级别脑胶质瘤、孤立脑转移瘤鉴别诊断中的应用价值。方法搜集经手术病理证实的高级别脑胶质瘤18例及孤立脑转移瘤12例,术前分别行常规MRI、增强扫描及1HMRS检查,测量两种肿瘤的实质强化区、中央坏死区、瘤周水肿区的代谢物浓度(包括NAA、Cho、Cr)及其比值的变化,并进行分析比较。结果两种肿瘤的T1WI多表现为等、低信号,T2WI呈不均匀高信号,伴有不同程度强化和瘤周水肿。高级别脑胶质瘤与孤立脑转移瘤实质区的1HMRS均表现为NAA/Cho、NAA/Cr下降,Cho/Cr升高,但其差异无统计学意义;中央坏死区的NAA/Cho、NAA/Cr差异有统计学意义,但Cho/Cr差异无统计学意义;瘤周水肿区NAA/Cho、Cho/Cr差异有统计学意义,但NAA/Cr差异无统计学意义。结论1HMRS可无创地分析脑肿瘤的代谢情况,有助于对高级别脑胶质瘤与孤立脑转移瘤的诊断和鉴别诊断。

Objective To investigate the value of ^1HMRS in differential diagnosis on high-grade gliomas and solitary metastases. Methods 18 patients with high-grade gliomas and 12 patients with solitary metastases were confirmed by pathology. All cases were performed routine MRI, contrast enhanced MRI and ^1HMRS preoperatively. Three regions,the solid component,necrosis and peritumoral edema of the two types of tumor, were raeasured,then the value of NAA, Cho, Cr and their ratio were obtained.The independent-samples t test was used to determine if there were significant statistical differenes in metabolic levels of the three regions between the high-grade gliomas and the metastase. Results The two types of tumor showed isointense or hypointense on T,-weighted image,heterogeneous hyperintense on T2-weighted image,with multiple enhancement and peritumoral edema.The solid components of high-grade gliomas and solitary metastases both showed the ratio of NAMCho and NAA/Cr decreased,Cho/Cr increased. But there were no significant statistical differences among the ratios.NAA/Cho and NAA/Cr in central necrosis regions have significant statistical difference,whereas Cho/Cr no.NAA/Cho and Cho/Cr in peritumoral edema regions have significant statistical difference,whereas NAA/Cr no. Conclusion ^1HMRS can be used to analysize the metabolism of cerebral tumor by noninvasive way, it may be helpful to differentiate high-grade gliomas from solitary metastase.