[Incidentally detected renal cell carcinoma: report of two early small cases]

We report two cases of small renal cell carcinoma, which were incidentally detected by abdominal computed tomography (CT) and ultrasound. Both tumors were less than 15 mm in diameter and low grade, stage I lesions. Incidentally found renal cancer does not always indicate better prognosis. However, in selected patients with small tumors, surgical enucleation may be an acceptable method of treatment even if the contralateral kidney is normal. Renal screening should be a routine part of abdominal ultrasound. In our institution, ultrasound revealed incidental renal cancer in 0.035% of non-urologic patients.