[Diagnostic difficulties and value of partial surgery in multiple tumors of the kidney. Apropos of 4 cases].

Multiple renal tumors are rare. Ultrasonic and CT scan examinations will suspect the diagnosis in the majority of cases. With the histological diagnosis and its prognosis, the treatment may be watchful waiting, partial nephrectomy or radical nephrectomy. Partial nephrectomy is indicated in case of multiple tumor in a patient with solitary kidney or for bilateral tumors. Urinary fistulas or renal insufficiency are potential complications, but they are exceptional. Four cases are reported (oncocytoma, angiomyolipoma, papillary tumor and adenocarcinoma) to illustrate the difficulty of diagnosis with imaging and the surgical options.