脑转移瘤是颅内常见肿瘤 ,其发病率约占全部脑肿瘤的2 0 % ,以肺癌最常见[1 ] ,典型表现为其多发性 ,单发转移因缺乏特异性与脑内原发恶性肿瘤鉴别有一定困难且发生率高达3 0 %～ 5 0 % [2 ] 。单发转移瘤诊断的确定对肺原发灶的临床治疗计划的制定起决定性作用。因此提高该病 Metastatic brain tumors are common intracranial tumors, the incidence of about 20% of all brain tumors, the most common lung cancer [1], the typical manifestations of its multiple, single metastasis due to the lack of specificity and the primary malignant brain Tumor identification has some difficulties and the incidence as high as 30% ~ 50% [2]. The diagnosis of solitary metastases plays a decisive role in the planning of clinical treatment of primary lung lesions. So raise the disease