Primary renal lymphoma: a clinical and radiological study.

Purpose: We assessed the incidence, clinical and radiological features, and prognosis of patients with renal lymphoma.
Materials and Methods: We studied 210 patients with symptoms, signs and and radiological findings suggestive of renal cell carcinoma.
Results: Final diagnosis in 6 of 210 patients (3%) was primary renal lymphoma. Radiological features were similar to those of renal cell carcinoma. Five of the 6 patients had an International Prognostic Index score of greater than 1. Despite appropriate chemotherapy, only 2 patients remain with complete remission.
Conclusions: Primary renal lymphoma is unusual but not rare. The relatively poor prognosis in our patients could be attributed to the adverse prognostic factors associated with aggressive nodal lymphomas.