GD-DTPA、MRI增强在脑转移瘤诊断中的价值

THE VALUE OF GD-DTPA ENHANCED MRI IMAGING IN DIAGNOSING CEREBRAL METASTASIS

目的 :探讨 GD- DTPA在脑转移瘤中的诊断及鉴别诊断价值。方法 :对 2 5例经手术及临床证实的脑转移瘤患者 ,行 MRI平扫及增强扫描 ,其中 9例行 CT平扫及增强。结果 :脑单发转移瘤 5例 ,多发转移瘤 2 0例 ,幕上转移 15例 ,幕下转移 3例 ,兼有 7例 ,3例合并脑膜转移。T1 WI发现病灶 35个 ,T2 WI发现病灶 45个 ,增强扫描发现病灶 12 5个 ,增强扫描发现病灶是非增强的近 2 .8倍。结论 :增强扫描 MRI对脑转移瘤的检出率明显高于非增强扫描 ,尤其对肿瘤与水肿的区分。

Objective:To study the characteristic demonstrations of pre enhanced and post enhanced MRI imaging in order to evaluate the diagnostic value of GD DTPA enhanced MRI imaging in cerebral metastasis.Methods:Twenty five cases with cerebral metastasis were studied with a 0.5T MR unit.T 1WI,T 2WI and enhanced T 1WI in all 25 cases were confirmed by pathology and clinical diagnosis.Results:There were single metastaqsis in 5 cases,multiple metastasis in 20 cases.The appearance of tumor is 35 by T 1WI,45 by T 2WI and 125 by contrast enhancement MRI.Conclusion:Enhanced MRI is helpful in diagnosing and differentiating the cerebral metastasis.Enhanced T 1WI is the most useful sequence for diagnosing meningeal metastasis and differentiating tumors from the surrounding edema.Plain scan of T 1WI and T 2WI,together with enhanced T 2WI,seems to be the first choice in diagnosing cerebral metastasis.