颅脑转移瘤的MRI诊断（附49例分析）

目的探讨MRI对脑转移瘤的诊断价值.材料和方法49例脑转移瘤患者,男31例,女18例,年龄33～72岁,平均50.4岁,所有病例均行颅脑MRI平扫及增强检查.结果MRI显示脑转移瘤主要为外源性,占91.8%;多发性较常见,占57.1%;转移部位多为脑实质(87.8%),其次为颅骨(6.1%)、软脑膜(4.1%)、幕下(2.0%)转移;大多数转移瘤的MRI表现为类圆形长T1长T2信号肿块,实性部分多数均匀增强.结论脑转移瘤的MRI表现具有一定特征,结合病史,大部分病例可做出正确诊断.

MRI Diagnosis of Cerebral Metastasis Tumor( An Analysis of 49 Cases)

Purpose:To evaluate the value of MRI in the diagnosis of brain metastases. Materials and Methods: Pre-and post-enhanced MRI scan were both performed on 49 patients with brain metastases(31 males and 18 females, aging from 33 to 72 years, with mean age 50.4). Results:MRI demonstrated that cerebral metastases were mainly from extracerebral organs(91.8%); multifocal metastasis occurred more frequently(57.1%);the cerebral parenchyma was the most common site of cerebral metastasis(87.8%),the following was the skull(6.1%)?the cerebral piamater(4.1%)and the inferior tentorium(2.0%); the most of them demonstrated round mass, hypointense signals on T 1 weighted image and hyperintense signals on T 2 weighted image, the solid portion of the usually enhanced homogeneously. Conclusion:Most cases of brain metastases can be diagnosed correctly according to the MRI charateristic findings combined with history.