A 4-year-old boy presented with abdominal pain following a fall on the playground, and was found to have a large retroperitoneal mass arising from the left kidney. Left nephrectomy and lymph node sampling were performed. The 535 g kidney showed a 10.0 cm soft pale tan mass in the upper pole associated with subcapsular hemorrhage. All lymph nodes were negative for tumor.
The master list with the correct answer
• Clear cell sarcoma of the kidney
• Cystic partially differentiated nephroblastoma
• Malignant rhabdoid tumor
• Mesoblastic nephroma
• Renal cell carcinoma
• Wilms tumor, favorable histology
• Wilms tumor, unfavorable histology
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• Appropriate diagnosis
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