肾脏淋巴瘤的CT和MRI表现

CT and MRI findings of renal lymphoma

目的:探讨肾脏淋巴瘤的CT和MRI表现。方法:回顾性分析12例病理确诊的肾脏淋巴瘤患者的CT和MRI影像学表现。结果:多发病灶4例,单发病灶2例,腹膜后淋巴肿直接蔓延3例,肾周淋巴瘤、肾脏弥漫性浸润和肾窦累及各1例。11例病灶境界不清但密度(或信号)均匀,12例CT平扫均呈稍高密度,5例MRI平扫在T1WI上呈稍低信号,在T2WI上呈低信号。12例增强扫描病灶强化均低于正常肾实质,其中10例呈渐进性强化,2例呈皮髓质期明显强化。结论:肾脏淋巴瘤的影像学表现形式多种多样,CT和MRI表现有一定特征性,是诊断、分期和随访的重要方法。

Objective： To investigate the CT and MRI findings of renal lymphoma. Methods： Imaging materials of 12 cases with renal lymphoma confirmed pathologically were analyzed retrospectively. Results： There were multiple lesions in 4 cases, solitary lesion in 2 cases, direct extension from retroperitoneal adenopathy in 3 cases, lymphoma of the perinephric space in 1 case, diffuse infiltration of kidney in 1 case and renal sinus involvement in 1 case. The lesions were ill-defined but homogeneous in 11 cases. The attenuation of the lesions were slightly higher than that of normal renal parenchyma at unenhanced CT in 12 cases. The lesions exhibited slightly hypointense on TIWI and hypointense on T2WI in 5 cases with MR imaging. The lesions showed less enhancement than that of normal renal parenchyma in 12 cases after intravenous administra- tion of contrast material. The lesions demonstrated progressive enhancement in 10 cases and obviously enhancement during corticomedullary phase in 2 cases. Conclusion： Renal lymphoma has a wide variety of manifestations. The CT and MRI find- ings of renal lymphoma show some characteristic signs and play an important role in the diagnosis, staging and follow up of renal lymphoma.