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[From the bad to the worse].

A sixty-five year old man, who had the left kidney removed for neoplasm, was admitted to evaluate a renal mass on the right side. Ultrasonography and TC scan were suggestive of neoplasm. A lower pole kidney ablation was made, otherwise a radical nephrectomy would have forced him into chronic dialysis. One month later the patient complained of a gross hematuria and asthenia. A new ultrasonography examination was made and was very helpful to get the right diagnosis.