College of American Pathologists

2010 — April Case of the Month

Posted October 08, 2010


CAP Foundation April 2010 Online Case of the Month

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A 45-year-old man with a history of horseshoe kidney was noted to have a right renal mass by CT scan. A partial nephrectomy specimen contained a 4.0 cm encapsulated tan/red friable mass in the upper pole, which appeared confined to the kidney. The tumor cells were cytokeratin (+), synaptophysin (+) and chromogranin (+).

The master list with the correct answer

  • Carcinoid tumor
  • Metanephric adenoma
  • Papillary renal cell carcinoma
  • Paraganglioma
  • Renal oncocytoma

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  • Appropriate diagnosis
  • Critique
  • References

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