颅内原发淋巴瘤的MRI诊断和鉴别诊断

目的 分析颅内原发淋巴瘤的MRI表现，提高诊断及鉴别诊断的能力。方法对6例经病理证实的颅内原发淋巴瘤的常规MRI资料回顾性分析其病灶大小、分布、信号特点及强化特征。结果MRI显示4例为单发，2例为多发，共9个病灶，其中位于大脑半球深部4个，灰白质交界区5个，累及胼胝体2个。影像学形态多为类圆形团块或结节，边界较清晰，占位效应及瘤周水肿较轻。T2WI呈等或略低信号，T2WI为等或略高信号。增强后病灶呈团块状或结节状显著强化。结论颅内原发淋巴瘤MRI信号及强化形式具有一定特征，将影像学征象与临床资料相结合综合分析有助于提高诊断准确率。

MRI diagnosis and differentiation of primary intracranial lymphoma

Objective To analyze MRI findings of primary intracranial lymphoma(PICL)for better diagnosis and differentiation.Methods MRI findings of six patients with pathologically proved PICL were retrospectively analyzed in size,location,signal and enhanced features.Results On MR images,single lesions were found in 4 cases and multiple ones in 2.Among the 9 lesions of 6 cases,4 located in deep brain tissue,5 in white gray matter junction.Corpus callosum infiltration was found in 2 cases.Most tumors presented as round like mass with well margin or nodule with slight para tumor edema and space occupying effect.On T1WI,the lesions were isointense or slight hypointense signal uhile on T2WI those were isointense or slight hyperintese signal.Following Gd DTPA administration,the lesions presented obviously mass like or nodular enhancement.Conclusion PICL has certain features in MRI signal and enhancement pattern.Accurate diagnosis is available when imaging findings are combined with clinical informations.