College of American Pathologists

2010 — February Case of the Month

Posted October 07, 2010


CAP Foundation February 2010 Online Case of the Month

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A 3-month-old boy was found to have a right-sided abdominal mass. CT scan revealed a large, right kidney mass. A right nephrectomy was performed demonstrating a 14 x 11 x 8 cm kidney with an upper pole mass and an intact renal capsule. Cut section revealed a tan-white, focally necrotic, hemorrhagic, cystic tumor arising from the cortex, invading the renal sinus, but not extending to the resection margin.

The master list with the correct answer

  • Clear cell sarcoma of the kidney
  • Congenital mesoblastic nephroma, cellular type
  • Congenital mesoblastic nephroma, classic type
  • Metanephric stromal tumor
  • Rhabdoid tumor of the kidney
  • Wilms tumor

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  • Appropriate diagnosis
  • Critique
  • References

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