Renal cell carcinoma with heterogeneously enhancing renal mass

A 63-year-old male smoker presents with 3 months of painless gross hematuria, right flank dull ache, and 6 kg weight loss. Examination reveals a palpable right flank mass. Laboratory tests show polycythemia (Hb 18.4 g/dL), hypercalcemia (11.6 mg/dL), and elevated LDH. Contrast-enhanced CT shows a 7 cm heterogeneously enhancing solid mass at the upper pole of the right kidney with central necrosis, no renal vein invasion, and negative chest imaging. The structure marked **D** in the diagram represents this lesion. Based on the imaging characteristics and clinical presentation, what is the most appropriate management strategy for this patient?