Primary MALT lymphoma of the kidney

A primary mucosa associated lymphoid tissue tumor (MALT) of the kidney in a 50-year-old man who suffered from on therapy resistent high blood pressure over 15 years period is presented. A mass in the right kidney (6x5x3 cm) d uring routine check up was discovered on ultrasonography and confirmed on C T scan and NMR. The patient was submitted to nephrectomy. A mass involving kidney, pyelon and upper part of the meter was found. Histology showed low grade non-Hodgkin B-cell lymphoma of MALT type. The neoplastic cells were p ostitive for monoclonal antibodies CD20, CD79 alpha, surface and cytoplasmi c and IgM immunoglobulins and showed light chain restriction (kappa(+)). Af ter histology was available, a careful staging was performed. The disease w as not found anywhere else. It was concluded that the patient belonged to t he stage IE of primary kidney MALT lymphoma. Gastroscopy showed signs of ch ronic superficial gastritis. Urease test was positive and IgG antibodies ag ainst Helicobacter pylori in titer 421 were found as well. Except for Helic obacter pylori no additional therapy was given.