Primary Renal Lymphoma Presenting as a Large Renal Mass - A Rare Case Report

Primary renal lymphoma is a rare and controversial entity. Well defined diagnostic criteria exist. Pre-operative diagnosis is rarely made as it is not routine to do a renal biopsy before nephrectomy for a kidney malignancy. Here we present a patient with grossly enlarged kidney. Based on atypical imaging and elevated lactate de hydrogenase, a renal biopsy was done, which revealed Non-Hodgkin's lymphoma of kidney. As the kidney was the only organ involved and bone marrow was not involved, it was labelled as primary renal lymphoma. The patient was spared of nephrectomy and early and appropriate chemotherapy was instituted. Patient responded well to chemotherapy.