脑原发性淋巴瘤的MRI诊断

目的探讨脑原发性淋巴瘤的MRI表现特征。方法回顾性分析经病理证实的20例脑原发性淋巴瘤的MRI表现。结果脑原发性淋巴瘤加例共52个病灶，位于脑深部近中线区域占78.8％，形态不规则占71．2％，内部发生囊变占15．4％，周围水肿占84．6％，未见钙化、出血；T1WI呈低信号（30．7％）等信号（63．5％），T2WI呈等信号（69．3％）高信号（26．9％），增强扫描均呈显著性强化。结论脑原发性淋巴瘤MRI有特征性表现，熟悉其MRI特点有助于对本病作出正确的诊断。

Study on MRI features of primary brain lymphoma

Objective To discuss MRI features of primary brain Lymphoma. Methods 20 cases with primary brain lymphoma proved by operation and pathology were examined by MRI. The MRI features were analyzed retrospectively. Results There were 52 lesions in 20 patients. The tumor might be single or multiple lesions, irregular in shape （71.2 % ）, cystic change （ 15.4 % ）. On T1WI, 30.7 % of lesions were hypointense and 63.5 % signal isointense , on T2WI,69.3% of lesions were isointense and 26.9% were high. All lesions appeared as marked uniform enhancement. 84.6% of primary brain lymphoma had edema. Conclusion Primary brain Lymphoma has specific MRI features, which is useful in diagnosis of this disease.