College of American Pathologists
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2008 — December Case of the Month

Updated December 16, 2008


CAP Foundation December 2008 Online Case of the Month

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A 57-year-old woman presented with hematuria. Radiographic studies revealed a left renal mass, and a radical nephrectomy was performed. The enlarged kidney was almost entirely replaced by an ovoid, 14.5 cm long, 8.5 cm diameter, firm tumor having a lobulated, pale gray-tan cut surface with areas of yellow-green necrosis. There was no gross evidence of vascular invasion or of renal pelvic extension. The tumor cells were smooth muscle actin (+) and cytokeratin (-).

The master list with the correct answer

  • Angiomyolipoma
  • Inflammatory myofibroblastic tumor
  • Leiomyoma
  • Leiomyosarcoma
  • Sarcomatoid renal cell carcinoma
  • Sarcomatoid urothelial carcinoma
  • Solitary fibrous tumor

Access Case Critique to view:

  • Appropriate diagnosis
  • Critique
  • References

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