AfectaciÓn perirrenal por enfermedad de Waldenström

OBJECTIVE: To describe radiological, histological findings and cytometric features of perirenal masses: an unusual involvement pattern of the kidney by Waldenstrom disease. This pattern, not associated with nodal regional disease should be considered in the differential diagnosis of penrenal pathology (extramedullary hematopoiesis, liposarcoma, haematoma...). METHODS/RESULTS: A 68-year-old man, with Waldenstrom macroglobulinemia presented in ultrasound exploration bilateral perirenal hypoecogenic mass. Histopathological examination and cytometric determination of fine-needle aspiration biopsy showed a monoclonal lymphoplasmocitoid proliferation of B-cells arranged in a diffuse pattern. CONCLUSION: Although perirenal involvement of the kidney by non Hodgkin lymphoplasmocitoid lymphoma is a rare phenomenon, this disease should be considered in differential diagnosis ofperirenal pathology. Histological and cytometric examination are essential for diagnostic evaluation.