颅内原发恶性淋巴瘤的CT与MRI诊断

CT and MRI diagnosis of primary malignant lymphoma in brain

目的:分析颅内原发恶性淋巴瘤的CT及MRI表现,提高对此病的认识,提高诊断及鉴别诊断的能力。方法:对47例经手术病理证实的颅内原发性恶性淋巴瘤的CT、MRI影像表现进行分析。结果:病灶单发或多发,肿瘤常位于脑表面或中线附近。CT平扫呈等或稍高密度影,边界较清。MRI表现T1WI呈稍低或低信号T2WI呈等或高信号。肿瘤占位效应轻,增强多呈"团块状"或"握拳状"强化。结论:颅内原发恶性淋巴瘤的CT及MRI表现有一定的特点,但缺乏特征性须与某些其他颅内病变鉴别,以减少误诊。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。

Objective：To analyse CT and MRI appearances of primary malignant lymphomas in brain in order to improve its diagnosis, for better diagnosis and diferentiation. Methods： The CT and MRI appearances of 47 patients with primary malignant lymphoma in the brain proved by operation, pathology or biopsy, were retrospectively analysed. Results： The single or multiple tumors were seen in the surface or middle line of cerebrum. The lesions were iso-intensity or hyper-intensity by CT plain scan. The lesions were iso-interme or slightly hypo-intcnse on T1 weighted image while iso-interme or hyper-intenae on T2 weighted imagc by MPd plain scan.Honmgemms enhancement presented in most cases, just like＂elosed fist＂ or＂clumped＂in most tumors. Most tumors showed minimal or moderate edema and mass space effect. Conclusion： The CT and MRI appearantes of primary malignant lymphoma in the brain have some features, but lack of characteristics. It is necssarry to be identified with some other mass lesions,in order to decrease mistaken diagnosis.Accurate diagnosis is available when imaging findings are combined with clinical informations.