目的 加强对肺癌脑转移MRI的认识，提高诊断水平。方法 收集我院2015年1月至2016年8月共180例经临床及病理证 实的肺癌脑转移的病例资料，回顾分析其MRI表现，180例患者均常规行T2－Tra、Flair_Tra、T1-Sag常规扫描， 110例行Gd-DTPA对比剂T1-Tra、T1-Cor 、T1-Sag增强扫描。结果 大脑半球转移63例，小脑半球转移位14例，81例 双侧大脑、小脑转移；22例全脑(双侧大脑半球、小脑及脑干)转移，其中2例全脑转移伴有脑膜转移。159例灶周伴 有脑水肿，84例伴有囊变坏死，49例伴有出血。结论 MRI平扫结合增强对肺癌脑转移的病灶有很高的诊断价值，能 准确评估患者脑部转移灶的部位、数目、形态、大小及水肿范围，瘤卒中的程度，周围脑组织受压情况，给临床医 生及患者选择治疗方案提供有力的依据。

Objective To reinforce the knowledge of MRI of cystic brain metastasis of lung cancer and improve the diagnostic level. Methods Collecting totally 180 cases data which have been confirmed by clinic and pathology as brain metastasis of lung cancer from January of 2015 to August of 2016 in our hospital, review and analyze their MRI indication, routine scan of T2-Tra, Flair Tra, T1-Sag for 180 cases, enhancement scan of Gd-DTPA contrast agent T1-Tra, T1-Cor, T1-Sag for 110 cases. Results Result 63 cases are diagnosed as cerebral hemisphere metastases, 14 cases as cerebellar hemisphere metastases, 81 cases are both cerebral hemisphere and cerebellar hemisphere metastases, 22 cases whole brain (both sides cerebral hemisphere cerebellar, hemispher and brainstem) metastases, 2 cases whole brainmetastases with meninx metastases among hem. Brain swelling was found around the lesion for 159 cases, cystoid necrosis was found on 84 cases, hemorrhage was found on 49 cases. Conclusion MRI plain and enhancementscan has a high diagnostic value for brain metastasis of lung cancer; it can accuratelyevaluate the location, quantity, shape, size, edema range, tumor extraction extent and compression situation of surrounding brain tissue on patients’ lesions. It can provide strong basis for the clinicians and patientswhile choosing the treatment plan.