MRI增强及延迟扫描在脑转移瘤诊断中的应用

Application of Post-and Delayed IV-contrast Enhanced MRI Diagnosis of Brain Metastasis

目的 :进一步探讨MRIT1WI增强及延迟扫描在脑转移瘤诊断中的应用。材料和方法 :回顾性分析近两年来经临床或手术病理证实的48例脑转移瘤MR图像 ,采用平扫、增强及增强后延迟扫描 ,比较增强前后及延迟扫描后病灶显示情况。结果 :①平扫发现病灶直接征象约占60 %。②增强后除1例强化不明显外 ,其余47例均见不同程度和形式的强化 ,较平扫时更清楚显示病灶形态、大小、边界、浸润范围。有17例显示出平扫无水肿、未显示的65个病灶。③延迟8～10min扫描病灶显示更清楚者17例 ,比增强后即时扫描增多者10例 ,共28个病灶。结论 :临床疑有脑转移瘤而行MRI检查的病人 ,增强扫描应成为常规 ,它能为诊断和治疗方法的选择提供更为丰富的资料 ,而增强后的延迟扫描 ,能提供更多、更全的信息 ,在脑转移瘤的诊断中 ,有一定价值。

Purpose:To further study of application of post-and delayed IV-contrast enhanced T 1 WI MRI diagnosis of brain metastasis.Materials and Methods:We reviewed48cases with brain metastasis using pre-,post-and delayed IV-contrast enhanced T 1 WI MRI in two years.All of these cases were confirmed by clinical,operative and pathologic data.Results:①The60%lesions were seen on pre-IV-contrast enˉhanced T 1 WI MRI;②On post-IV-contrast enhanced T 1 WI MRI,47ones of48cases were revealed the enhanced lesions on different degrees and shapes and their sizes,shapes,margins were clearer.Only one cases was no obvious enhanced T 1 WI MRI;③Of10cases,there were more28lesions on delayed than on post-IV-contrast enhanced T 1 WI MRI.Of others,no more lesion was found on delayed IV-contrast enhanced T 1 WI MRI.Conclusion:If the patient with brain metastasis were suspected,the post-IV-contrast enganced T 1 WI MRI could be as a conventional image diagnosis.The delayed IV-contrast enˉhanced T 1 WI MRI may provide more information.Their clinical value should be important.