目的：：探讨单发脑转移瘤( solitary brain metastasis,SBM)的MRI表现,提高对其诊断的准确性。方法：回顾性分析经临床综合确诊的38例SBM的MRI平扫及增强表现,分析病灶的部位、大小、瘤周水肿程度和瘤体的强化特点。结果：本组38例SBM中,发生于幕上31例,其中位于脑皮质和皮质下区28例；幕下7例。瘤体直径<1.0cm有12例,1.0cm-3.0cm 19例,>3.0cm 7例。增强扫描所有病灶均出现强化,其中结节型强化19例,环型强化11例,混合型强化8例。瘤周无水肿7例,轻度水肿11例,中度水肿13例,重度水肿7例。结论：SBM的MRI表现具有一定的特征性,MRI增强扫描对其诊断和鉴别诊断具有重要价值。%Objective:To evaluate the MRI performance of solitary brain metastasis( SBM) ,and to improve the di-agnostic and differential diagnosis accuracy of SBM. Methods:Retrospectively review the MRI scan and enhanced scan of 38 cases of SBM by clinical comprehensive diagnosis. Analyze the location of tumor,size,peritumoral edema as well as findings after contrast enhancement. Results:In 38 cases,31 lesions were located at supratentorial regions,in which 28 tumors were located in cortex and subcortex. Seven lesions located at infratentorial regions. The diameter was less than 1. 0 cm in 12 cases,between 1. 0 cm to 3. 0 cm in 19 cases,and larger than 3 cm in 7 cases. All lesions showed enhancement,among which nodular enhancement was in 19 lesions,ring-like enhancement in 11 lesions,and mixed-shape enhancement in 8 lesions. Seven cases had no peritumoral edema,11 cases with mild edema,13 cases with moderate edema,and 7 cases with severe edema. Conclusion:The MRI performance of SBM had certain charac-teristics,and MRI enhanced scan had important value for the diagnosis and differential diagnosis of SBM.
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