The angiographic findings (hypovascularity, spokewheel phenomenon, lucent rim, linear course of vessels) and CT features (central scar, hyperdense without contrast medium) of 20 patients with renal oncocytomas were analyzed. Simultaneously seven patients with renal cell carcinoma preoperatively misdiagnosed as oncocytoma were compared and critically discussed. Preoperatively, reliable differentiation of renal oncocytoma and renal carcinoma is not possible. Nevertheless, in the presence of features typical for oncocytoma the operative strategy should be "kidney-preserving surgery".
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