脑内原发性淋巴瘤MRI表现

目的:分析脑内原发性淋巴瘤的MRI表现。方法:回顾性分析17例经病理证实的脑内原发性淋巴瘤的MRI资料,所有病例均行MR平扫及增强扫描,其中2例行弥散加权成像。结果:17例脑内原发性淋巴瘤共34个瘤灶;其中单发8例,多发9例;幕上病灶29个,幕下病灶5个。MR平扫T1WI等信号15个病灶,略低信号19个病灶,T2WI呈等低信号23个病灶,略高信号11个病灶;增强扫描肿瘤均匀强化22个,不均匀强化12个,瘤周轻度、中度水肿各17个病灶。2例共3个瘤灶弥散受限。结论:脑内原发性淋巴瘤磁共振表现具有一定的特征性,认真分析其特点,可提高诊断的准确性。

Primary lymphomas in the brain: MR findings

Objective：To explore the MR findings of primary lymphomas in the brain.Methods：MR findings of 17 cases with primary lymphomas in the brain were retrospectively analyzed.And two cases were examined by diffuse weighted imaging.Results：34 tumor masses were found in the 17 cases.And 8 cases were found with single lesion and 9 cases were with multiple lesions.There were 29 lesions located at supratentorial region and 5 lesions located at infratentorial region.The lesions demonstrated isointensity signal（15 lesions） and slightly hypointensity signal（19 lesions） on T1WI;and isointensity signal（23 lesions）,slightly hyperintensity signal（11 lesions） on T2WI.After Gd-DTPA injection,obvious homogeneous enhancement was shown in 22 lesions and hetergeneous enhancement shown in 12 lesions.Slight para-tumorous edema was found in 17 lesions,moderate edema in 17 lesions and marked edema was not found.3 lesions of 2 cases were hyperintensity on DWI.Conclusion：Most of primary lymphomas in the brain have relatively distinctive MRI features,and misdignosis can be reduced if enough attention is paid to the analysis of the MR imaging.