The article describes involvement of the kidneys in 2 patients suffering from malignant lymphoma. In the first patient, small nodular infiltrates are seen in the symmetrically enlarged kidneys. In the second patient, a large, intrarenally growing tumour can be observed on the right, whereas on the left side an abdominal lymphatic node can be seen growing into the kidney. At the same time, there are lymphatic infiltrates of different size in both kidneys. The diagnosis is basically established by computerised tomography combined with visualisation of enlarged abdominal lymphatic nodes, both kidneys being involved; at the same time, the intrarenal infiltrates are found to possess a density which largely corresponds to that of the surrounding lymph nodes.