脑内原发性恶性淋巴瘤的影像学表现

目的:分析脑内原发性淋巴瘤的CT、MRI表现特点。方法:回顾性分析25例经病理证实的脑内原发性淋巴瘤的CT、MRI资料,所有病例均行平扫及增强扫描。结果:病灶单发18例,多发7例,共37个病灶,其中幕上33个,幕下4个。CT平扫表现为等或稍高密度,MRI平扫T1WI呈等或稍低信号,T2WI呈高信号,增强扫描均见肿瘤均匀或不均匀强化;瘤周多为轻、中度水肿。结论:原发性脑淋巴瘤影像表现具有一定的特征性,但与其它颅内病变有重叠及类似之处,认真分析其特点,可提高诊断的准确性。

Imaging features of primary malignant lymphomas of the brain

Objective:To analysis the CT and MRI features of primary brain lymphoma.Methods:The CT and MRI data of 25 cases diagnosed as primary brain lymphoma by surgery or biopsy were analyzed retrospectively.All the cases were performed by plain scan and enhanced scan.Results:There were 18 cases with single lesion and 7 cases with multiple lesions.There were 37 masses,the 33 lesions distributed in supratentorium,of 4 lesions in inferior tentorium.On CT: lesions appeared as iso-or high density.On MRI: hypointensity or isointensity on T_1WI and hyperintensity on T_2WI were observed.Homogeneous or inhomogeneous enhancement presented in most of the tumors.Most lymphomas in the brain showed minimal or moderate edema.Conclusion:The imaging finding of primary brain lymphoma has certain characteristics,but overlap with those of other intracranial mass lesions.By analysis the features of lymphoma,we can improve the accuracy of diagnosis.