摘要 目的：探讨中枢神经系统淋巴瘤的影像学特征。方法：对19例经手术及病理证实的中枢神经系统淋巴瘤的影像学表现，特别是MR表现进行分析。结果：单发肿瘤15例，位于幕上13例，幕下2例。多发肿瘤4例。多数病灶位于深部白质，14例病灶邻近脑室。肿瘤平均最大径超过3cm。T1像14例信号较低，5例等信号。T2像5例低信号，余为等信号。肿瘤水肿相对较轻。注射造影剂后，肿瘤多数均匀强化。病理均为NHL恶性淋巴瘤。结论：中枢神经系统淋巴瘤的影像学表现与某些中枢神经系统病变有类似及重叠之处。通过认真的影像分析并结合活检结果，有利于治疗方法的选择。

    MRI of lymphoma of central nervous system Sun Bo, Wang Chungcheng, LuoLin, et al. Beijing Neurosurgical Institute, Beijing 100050

    Abstract Objective: To probe into the imaging characteristics oflymphoma of central nervous system. Methods: MRI was done in 19 patients with CNSlymphoma. All were operated on with a proven histological diagnosis were available.Results: CNS lymphoma presented a single lesion in 15 cases and multiple lesions in 4cases. 13 of them were within cerebral hemispheres and 2 in posterior fossa. Most of thelesions deposit within the subcortical white matter and often in close proximity to theventricles. The lesions measured from 1.5 to 4.5cm in radial dimension. The 14 lesionswere slightly hypointense and 5 were isointense on T1-weighted imaging. On the T2-weightedimaging the lesions were hypointense in 5 cases and isointense in others. Most of thetumors had little edema around. All lesions enhanced homogeneously. Conclusions: The MRfindings of the CNS lymphoma overlap with those of other intracranial mass lesions. In apatient whose MR scan findings suggestive of CNS lymphoma, a needle biopsy is rationalnext step in the work-up of therapy selection.

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