中枢神经系统淋巴瘤MRI表现

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

Objective: To probe into the imaging characteristics of lymphoma of central nervous system. Methods: MRI was done in 19 patients with CNS lymphoma. 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 4 cases. 13 of them were within cerebral hemispheres and 2 in posterior fossa. Most of the lesions deposit within the subcortical white matter and often in close proximity to the ventricles. The lesions measured from 1 5 to 4 5cm in radial dimension. The 14 lesions were slightly hypointense and 5 were isointense on T1 weighted imaging. On the T2 weighted imaging the lesions were hypointense in 5 cases and isointense in others. Most of the tumors had little edema around. All lesions enhanced homogeneously. Conclusions: The MR findings of the CNS lymphoma overlap with those of other intracranial mass lesions. In a patient whose MR scan findings suggestive of CNS lymphoma, a needle biopsy is rational next step in the work up of therapy selection.