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A 4-year-old boy presents with a 2-week history of intermittent abdominal pain and a palpable right-sided abdominal mass. Physical examination reveals a firm, non-tender mass that crosses the midline. Blood pressure is 128/84 mmHg. Urinalysis shows microscopic hematuria. CT scan shows a large heterogeneous mass arising from the right kidney with calcifications. What is the most appropriate next step in management?
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