A 48-year-old woman presented with flank pain. Imaging studies revealed a multicystic lesion of the right kidney suspicious for renal cell carcinoma. A nephrectomy was performed. The resected 754 g kidney contained a 12.5 x 12.0 x 9.0 cm multiloculated cystic mass with focal white solid nodules, grossly abutting the renal pelvis but apparently confined to the kidney.
The master list with the correct answer
• Cystic partially differentiated nephroblastoma
• Metanephric adenofibroma
• Mixed epithelial and stromal tumor
• Multilocular cystic renal cell carcinoma
• Solitary fibrous tumor
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