Abstract：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 T1WI 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 administration 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 findings of renal lymphoma show some characteristic signs and play an important role in the diagnosis, staging and follow up of renal lymphoma.
2009, Vol. 20 
